Geometry
posted by Amber .
find the coordinates of the missing endpoint given that S is the midpoint. Problem: T(4,3),S(1,5)

the length of TS must be 3 in the x, and 2 in the y. Look at how I figured that out.
So the endpoint must be (2,7) check me. 
1 = (4 + x) divided by 2 which results in x = 2
5 = (3 + y) divided by 2 which results in y = 7
Thus the missing point is (2,7).