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posted by don Saturday, September 15, 2012 at 3:45pm.
if AB=CD, AB is 12-y, CD = 3x-4y, BD = 18, AC = x+y, what is x, y, and AC
No way to tell, unless ABCD is a parallelogram. In that case, AB=CD and AC=BD 12-y = 3x-4y x+y = 18 (x,y) = (11,7)
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