Posted by Stephanie on Wednesday, September 28, 2011 at 2:06pm.
The midpoint of a line segment is just halfway from A to B. So, the coordinates are just the average of the endpoints.
If C = midpoint of AB then
C = ((3x+5 + x-1)/2,(3y + -y)/2)
= ((4x+4)/2,2y/2) = (2x+2,y)
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