Posted by don on .
if AB=CD, AB is 12y, CD = 3x4y, BD = 18, AC = x+y, what is x, y, and AC

geometry 
Steve,
No way to tell, unless ABCD is a parallelogram. In that case, AB=CD and AC=BD
12y = 3x4y
x+y = 18
(x,y) = (11,7)