# Geometry

posted by
**Jim**
.

If M is the midpoint of line AB.How do i Find the coordinates of B given A(4,-2) and M(1,3).

M = (A + B)/2 ---->

B = 2 M - A = 2(1,3) - (4,-2) =

(2-4,6+2) = (-2,8)

posted by
**Jim**
.

If M is the midpoint of line AB.How do i Find the coordinates of B given A(4,-2) and M(1,3).

M = (A + B)/2 ---->

B = 2 M - A = 2(1,3) - (4,-2) =

(2-4,6+2) = (-2,8)