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The midpoint of GH is M(5,3). One endpoint is G(1,-5). Find the coordinates of the other endpoint H.

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typicaljoi
The answer is (9,11) 

Midpoint formula: (x1 + x2)/2, (y1 + y2)/2, where (x1, y1) and (x2, y2) are the endpoints of the segment 

x-coordinate of midpoint = (x1 + x2)/2 
5 = (1 + x2)/2 
10 = 1 + x2 
9 = x2 

y-coordinate of midpoint = (y1 + y2)/2 
3 = (-5 + y2)/2 
6 = -5 + y2 
11 = y2 

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