Question

Line segment AB has a midpoint, M at (2,6). If point B is located at (-3,10), what is location of point A?

Answer 1

Answer is D.
As M is the midpoint of A and B; denote A(x,y); then x and y have to matched the two equations below:
(x- 3) : 2 = 2 <=> x = 7 and
(y +10) : 2 = 6 <=> y = 2
Conclusion : A (7,2)