the midpoint of AB is M (0,-3) if the coordinates of A are (2,1) what are the coordinates of B

Answer 1

Let B = (x, y)

Then, (x + 2) / 2 = x-coordinate of M = 0. So, x = -2.

(y + 1) / 2 = y-coordinate of M = -3. So, y = -7.

Therefore, B = (-2, -7).