Question

The midpoint, M, of segment AB has coordinates (2,−1) . If endpoint A of the segment has coordinates (−3,5) , what are the coordinates of endpoint B?

Answer 1

let it be B(x,y)
for the x:
(x-3)/2 = 2
x-3 = 4
x = 7

for the y:
(y+5)/2 = -1
y+5 = -2
y = -7
B is (7, -7)