Posted by Maccbath on Sunday, February 19, 2012 at 10:18am.
I assume you have listed the sides in order going around the parallogram.
Opposite sides are equal, so ...
2x+y = 5y-8 ----> 2x-4y = -8
3y-2x = 4x-3 ---> 6x - 3y = 3
divide the 2nd by 3
2x - y = 1
2x-y = 1
2x-4y = -8
subtract them
3y = 9
y = 3
then 2x-3=1
x = 2
for perimeter, evaluate each of the sides using the values for x and y, then add up the length of the sides.
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