Finding the midpoint By using x and y coordinates, it is easy to find the midpoint of a line segment. The midpoint is calculated by taking the average of the x coordinates and then taking the average of the y coordinates.

The midpoint is (-6,8)

One endpoint of a line segment is at (-3,2) and the midpoint is at (3,-8). Where is the other endpoint?

Similarly:

The other endpoint is (9,-18)