How do i do this?

Question

Find the coordinates of the other endpoint of the​ segment, given its midpoint and one endpoint. Midpoint (8,-15), endpoint (4,-12)

Answer 1

mid point x - endpoint x = 4, add 4 to midpoint x, to get other endpoint x of 12

mid point y - endpoint y = -3, add -3 to midpoint y, to get other endpoint y of -18