Question

M(-2,-3) is the midpoint of RS. If S has coordinates (3,6) find the coordinates of R

A) (-7,15)
B) -7,-12)
C) (8,-12)
D) (8,15)

Answer 1

( Sx + Rx ) / 2 = Mx
(Sy+Ry)/2 = My

Mx = -2
Sx + Rx = -4
Sx = 3
3 +Rx = -4
Rx = -7

My = -3
Sy+Ry = -6
Sy = 6
6 + Ry = -6
Ry = -12

R(-7,-12)