SOLUTION: if i have the midpoint of line RS but only the coordinates for point S how do i find point R?

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Question 878444: if i have the midpoint of line RS but only the coordinates for point S how do i find point R?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
The midpoint is the average of the x values and the y values for points R and S.
x%5Bm%5D=%28x%5Br%5D%2Bx%5Bs%5D%29%2F2
x%5Br%5D=2x%5Bm%5D-x%5Bs%5D
Similarly for y
y%5Bm%5D=%28y%5Br%5D%2By%5Bs%5D%29%2F2
y%5Br%5D=2y%5Bm%5D-y%5Bs%5D