Find the line of best fit on the TI-86
How to find the line of best fit on the TI-86 Check out this instructional math video that demonstrates how to find the line of best fit using the TI-86 graphing calculator. Learn how to draw the scatter diagram for the given data, find the equation of the line of best fit, and how to graph that line of best fit on top of the scatter diagram. This step-by-step guide uses arrow keys to lead you through the simple process of using your TI-86 graphing calculator.