Posted by Beatrice on Thursday, December 8, 2011 at 7:45pm.
If a line segment has endpoints A(3x+5, 3y) and B(x1, y) what are the coordinates of the midpoint AB?

geometry  Steve, Friday, December 9, 2011 at 10:29am
the midpoint is just the average of the endpoints:
M = ( ((3x+5)+(x1))/2 , (3y+(y))/2 )
= ((4x+4)/2 , 2y/2)
= (2x+2,y)
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