Question

20 points.

The midpoint of AB is (-9, -10) and the coordinates of point A are (-1, 9) what are the coordinates of point B? ​

Answer 1

B = (-17, -29)

Explanation:

The midpoint (M) of AB is ...

M = (A +B)/2

Solving for B gives ...

B = 2M -A = 2(-9, -10) -(-1, 9) = (-18+1, -20 -9)

B = (-17, -29)