Posted by **Beatrice** on Thursday, December 8, 2011 at 7:45pm.

If a line segment has endpoints A(3x+5, 3y) and B(x-1, -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)+(x-1))/2 , (3y+(-y))/2 )

= ((4x+4)/2 , 2y/2)

= (2x+2,y)

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