Question

Which points on a scatter plot do you use to create a linear equation?

Answer 1

Preferably, all of them.

If you have fantastic data, you should be able to draw a straight line through all of the points.

However, this is not true in most cases.

When you have a scatterplot where not all of the points line up, you have to try your best to draw a line that goes through the middle of the group of points, like this:

You can find the exact line that "best fits" your points by using a graphing calculator (it should be called "linear fit").