Point M is the midpoint of AC, find the coordinates of C when you are given one endpoint and the coordinates of the midpoint
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If (x,y) are the coords of C, the coords of M are the average of the coords of A and C.

Therefore, ((x+5)/2,(y-1)/2)=(4,1), x+5=8, x=3; y-1=2, y=3. C is (3,3).

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