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How To: Determine whether a pair of lines are perpendicular

See how to tell whether a set of lines are perpendicular to one another given their equations with this free video math lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series o...

How To: Line a Baseball Field

Every type of athletic field or court requires maintenance to preserve the quality of the playing surface. Baseball might be the most labor-intensive field maintenance sport of all, with its mixture of surfaces and the very exacting lines chalked from home plate to the outfield wall. This video explains some tips and techniques for lining a baseball field properly with an old-fashioned lining machine. It works for football too!

How To: Graph an inequality in slope-intercept form

This how to video shows you how to graph an inequality in slope intercept form. First, graph the line. Depending on the inequality, use a dash or solid line. Use a solid line for less than or equal to or greater than or equal to. Use a dash line for greater than or less than. If y is less than or less than or equal to, shade the bottom area of the line. If it is y is greater than or greater than or equal to, shade the top area of the line. Check your answer by substituting in any point from t...

How To: Tie a fly to a fly fishing line

The most important aspect of fly fishing is the fly! In this tutorial, learn how to tie a fly to your line for fly fishing. You will learn how to attach a fly to the leader on your line. A fly isn't attached to a fly fishing line because the leader is attached to the fly line, and the fly is attached to the leader. Find out how to moisten fly line to reduce friction and strengthen the knot with help from an experienced fly fisherman in this instructional video on fly fishing equipment.

How To: Write and graph an equation in slope intercept form

This video teaches us the method to write an equation in slope intercept form and to graph it. The equation of line is y = mx + c. m is the slope and c is the y intercept or the point where it crosses the y axis. Let us find the equation of line if it crosses (8,6) and m=1/2. Substituting the values of x,y and m we get 6=(8)(1/2)+b. Simplifying we get b=2. Substituting the values in the equation of line, we get y = m/2 + 2. Suppose we want to find the x coordinate of a point on the line given...

How To: Line and cast a fishing rod

In this brief video tutorial, the host Ian Leahy gives you step by step instructions about how to line and cast a fishing pole. For this video you'll need your baiting hook, some small line weights, bait, plyers, and some heavy-weight fishing line. First, he suggest you check your reel to insure that it functions properly, and to be sure to keep your bail down while you line your fishing rod. He also gives you some excellent tips on how to make lining your rod simpler. Keep watching while he ...

How To: Get rid of tan lines

Want to get rid of tan lines, reduce your chances of developing skin cancer but, like, nevertheless maintain a totally bodacious tan? With the self-tanning solutions made available by modern chemistry, it can be done. Discover how a spray tan booth can fix tan lines with help from a professional skin care specialist in this free video on tan lines and skin care.

How To: Paint Obi-Wan Kenobi from Star Wars

This artist shows how to quick paint/draw Obi-Wan Kenobi utilizing his mouse and pc. He starts out with a rough sketch of his character, making a black outline of his figure. He then goes back over his initial sketch with blue lines, cleaning up the lines, making them smoother. Once the blue lines are completed, the first black line sketch is erased and the blue lines smoothed out even more! Piece by piece, color is applied to each part of the character. It is placed roughly at first but smoo...

How To: Create a simple line chart in Excel 2007

Namuoc demonstrates how to create a line chart in Excel. To create a simple line chart in Excel 2007, first highlight the cells in your worksheet that you would like to include in the chart. Then, select the insert tab on the top of the worksheet toolbar. Next, click on the line option. Select the two dimensional line graph option from the given choices. Move the chart to a new sheet. Label the new sheet in the appropriate field and click the OK button. Your line chart will now be created usi...

How To: Draw the letter "G" as a block 3D letter

The instructor in this video is showing viewers how to make a Block G in 3D. The process involves drawing the initial capital G. Then a line is made as an outline around the top of the letter and another line is made the same way at the bottom of the letter, so it appears to have a G made with 3 lines. Then the whole G is colored in to make a solid block letter. At the top of the G, a parallel line is drawn and filled in to appear the top is 3D. Another parallel line is drawn at the bottom in...

How To: Draw a face with guide lines

How to draw a face with guide linesIn this video we are about to see how to draw a face with guide lines. Even though the tutorial don’t get into the full details of how to draw a face it guides us with the basics. To start with is drawing the outline of the face and the guide lines. The focus mainly is on placing the eyes, nose and lips on the right spots. The center vertical line to cut the head to two halves and horizontal line in the middle for our eyes. Draw horizontal lines for the nose...

How To: Solve closed line integrals on conservative fields

This three part video walks you through the steps of solving closed line integrals on conservative fields. This excellent video shows you a clean blackboard, with the instructors voice showing exactly what to do. Don't fret, any question you may have, will be answered. Watching this video will make you feel like your back in the classroom but rather comfortably from your home.

How To: Use Green's Theorem to solve a line integral

This three part video walks you through using Green's theorem to solve a line integral. This excellent video shows you a clean blackboard, with the instructors voice showing exactly what to do. Don't fret, any question you may have, will be answered. Watching this video will make you feel like your back in the classroom but rather comfortably from your home.

How To: Draw Eeyore from Winnie the Pooh

The user demonstrates how to draw Disney's Eeyore in this video. The first step is to draw a circle about the size of a 50 cent piece for his head and add construction lines to it, including one across the lower part of the circle to use as a reference. The user also suggests creating a mark below the "head" to mark where the end of Eeyore's jaw will be. Then, starting at the bottom cross line, he begins drawing the rounded area of his snout. Next, he draws a straight line from the other side...

How To: Graph lines using x and y intercepts

A line is defined by two connecting points on a graph, and intercepts are the points on both the x- and y-axis, where the line intersects. This video tutorial demonstrates how to graph lines using x and y intercepts in a given area. This instructional video also graphs various examples of equations and explains the associated methodology.

How To: Draw a 3d staircase

This wordless video shows how to draw a staircase in 3d. Start by drawing the steps in one dimension. Extend two lines at the top of the stairs the width you want the steps to be. Draw another line between them to make a square. This creates a landing. Draw two lines downward and parallel to the steps from the line at the top of the stairs. This will create a rail and a second base. Then extend lines from each jut of the one dimensional steps, stretching the lines alternately to the base and ...

How To: Tie the fly fishing line to the backing

In this video tutorial, viewers learn how to tie a fly fishing line to the backing. Users will need a nail knot tool. Put the backing into the tool, leaving about 6 inches sticking out. The wrap the line around the tool 5 times, pushing the loops together. Take the end of the line and run it through the groove of the tool. Put the fly line through the other end about 2-3 inches. Then hold the loops in your hand, remove the tool and pull on the backing to tie it. This video will benefit those ...

How To: Draw cartoon character Dale from Chip & Dale's

This video shows us how to draw a Dale character. First you draw a ball about the size of an orange. Insert construction lines in the shape of a cross. Starting with the small middle area, draw the mask outline and add the ears at the top. Draw in the nose under the middle line. Draw the cheeks outside the construction line on both sides. Add smile lines on each side and draw a curve between them for the mouth. Extend the lower part of the mouth outside the construction line. Insert teeth and...

How To: Find the equation of a line given 2 points

This tutorial teaches you how to find a mathematical equation of a line given 2 points that exists on the line. The tutorial starts off with 2 points labeled (2,-4) and (3,6). The first step is to determine the slope of the line using the formula given in the tutorial in blue. The slope is then solved as 'm'. Plug the slope and the points into another formula given in green. The tutorial maker provides a tip that one can use x1 and y1 or x2 and y2, however, it must be consistent. After, solve...

How To: Graph quadratic equations

In this video, the instructor shows you how to graph quadratic equations. When you have a quadratic equation in terms of x and y, first try to identify the coefficients of the terms. Now use front end of the quadratic formula to find the line of symmetry which is the first half of the vertex using the formula x = -b/2a. This gives the line of symmetry. Next, plot the line using a few points starting at the line of symmetry. Take sample values of x and find the corresponding values of y on eit...

How To: Solve systems of linear equations by graphing

In this video the instructor shows how to solve systems of linear equation by graphing. A system of linear equation is equations of two lines that are to be graphed on the same coordinate axes. Now take the first equation and write it to form y = mx + b. Now extract the value of slope m and graph the line as shown in the video. Similarly graph the equation of the second line as shown in the video. Now if the two lines intersect at a point, that point is the solution to the system of that line...

How To: Find the equation of a line

In this video the instructor shows how to find the equation of the line given its slope and a point that lies on it. If the slope of the line is m and the point that lies on it is (x,y) then you can find the equation of the line by substituting the values in the slope-intercept form of an equation which is y = mx + b. Now substitute the values in the above equation and solve it for the value if the y-intercept y. Now you have the slope m and y intercept b. Substitute these values in the gener...

How To: Figure out the slope of a line

In this video you will learn how to find a slope of a line. The man in the video shows in a practical and easy way, how to do it with formulas. First he teaches how to find slopes of lines containing both negative and positive points. He shows with formulas how to do it. He teaches how to find slopes on a flat line and demonstrates that the slope of it is equal to 0. Next, he teaches a "trick" to help students learn how to identify zero and no slope lines. In the last example, he demonstrates...

How To: Tie fishing knots

Learn the right way of tying 3 handy fishing knots by watching this video. The first knot shown is the 'Clinch Knot'. One end of the fishing line is passed through the eye of the fishing hook. This end is pulled and wound around the main line about 6 to 8 times. Thereafter, the free end of the line is passed through the small loop formed at the beginning of the winding process. The winds are gently pushed to tighten the knot. The free end is then tucked in to complete the clinch knot. The nex...

How To: Graph negative numbers on number line

The video begins with a piece of paper with questions 6 and 7 on from section 1.3. The narrator introduces these two questions as both having to do with graphing on a number line. Starting with question 6, which asks the person to graph -11/4 on a number line, the narrator draws a number line with the numbers up to -5 on the left, up to +5 on the right of 0 in the middle. She starts by showing -3 as an example, and then draws a black dot on the line at the point of the number 3. She then illu...

How To: Find the slope given 2 points

This tutorial will show you how to determine the slope of a line if you are given two coordinates on a coordinate plane. You should first find the location of each point on the plane, remembering that the coordinates are in the format of x-axis (or horizontal movement), followed by y-axis (vertical movement). After plotting both these points, you should draw a straight line between these two points and then determine the slope of this line by taking the rise over the run of the line.

How To: Derive the equation of a straight line

In this tutorial the instructor shows how to derive a straight line equation. He shows us a process that consists of two steps. In step one he uses the slope formula to obtain the slope of the line which is the ratio of difference of y-coordinates and difference of x-coordinates. Now in the step two he uses the slope he obtained in the first step and equates it two a another slope derivation which uses a generic x, y variables and a real point. Now solving this equation he arrives at the equa...

How To: Install software on Linux

Finding Linux hard to handle after using Windows? Well this should help, here is how to install software on Linux. Start off by clicking on application launcher. Here go into applications, then into 'system' where you should find software management. In this program go straight into the settings and then edit software sources. Under 'downloadable from internet' make sure every option has a check against it. Now press the software management tab on the side. Now this is where you can get which...

How To: Simply read palms

In this video the instructor shows how to do a ice breaker by offering to palm read. He shows you the figure of a palm with various curves and labels them with different names. He claims that these various lines relates to the facts of our life and we can easily read them. He points to the various lines like Lifeline line, success curve, love line and other kind of lines. He further explains in depth about these various lines and how to interpret them. This video shows how to palm read someon...

How To: Determine if a point lies on a line in slope intercept

In this video the author shows how to find out if a Point lies on a Line in Slope Intercept Form. He shows it by an example where he takes a point, which is an ordered pair in the form (x, y) and a line, which is an first degree equation. Now he substitutes the values of x and y in the equation and checks if both the sides of the equation match. If it matches we can conclude that the point lies on the line. By following the method given in this tutorial you can find out if a given point lies ...

How To: Find the slope of a line

Learn how to find the slope of a line in this math tutorial. Whether you're doing your math homework or trying to figure out how steep a mountain is, the slope of a line is simple to calculate and has many practical uses.

How To: Use an aft spring line in sailing

An aft spring line can be useful for a number of reasons in sailing. It runs from the bow of the boat backwards to a point on the pier. If there's a boat behind you, the aft spring line will be needed. Take a look at this instructional video and learn how to use this line in sailing.

How To: Tie a bent solomon bar on a line

The Solomon Bar is one of the more versatile ties in the paracording genre of knot tying. Although most prefer the straight line, in this video you will learn how to tie a bent line in your knot. You will get a full tutorial of the entire process with each step shown up close with extreme detail.

How To: Tight line your eyes with pencil

In this makeup tutorial, Petrilude gives you the lowdown on tight-lining your eyes with pencil. Petrilude does this so he can get the look of a darker lash line, and give himself the appearance of denser lashes. It still doesn't take away lid space, so there's plenty of room still to play with colors on the eyelids. Try it out yourself!

How To: Make a halter dress out of old t-shirts

Of two old t shirts, one is taken and marked from the collar to under the armpit on all four sides of the t shirt. The marked lines are cut along. The shirt is tried on and pinched and pinned under armpit until the right fit and marked with chalk. Both sides of the shirt is cut off and along the chalk line is pinned. A straight edge and chalk is used to make a line from the pin to the bottom edge of the shirt on both sides.Both side of chalk lines are pinned down. The bottom is made even with...

How To: Read life lines on palms

Check out this video palmistry tutorial to learn how to read the life lines on your or someone else's palms. There are lots of interesting and good tips that you can do right now while sitting at your computer. No need to go to a psychic, read the life line on your palm by following along with this how-to video!

How To: Make a clear silicone rubber mold

This is an excellent video that covers creating a clear silicone rubber mold to deal with a complex parting line or irregular shape. When a project requires a complex parting line, it is often easier to pour the entire mold in one process with clear rubber, then cut your parting line. This process also saves at least a day in creating the mold. This process can be used in automotive, mechanical, fine art and film special effects uses.