Posted by Precious on Monday, February 27, 2012 at 10:50am.
what's the problem?
perimeter is the sum of the sides.
Let z be the third side.
x+2 + x-1 + z = 4x+1
z = 4x+1 - (x+2) - (x-1)
z = 4x+1-x-2-x+1
z = 2x
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