Posted by Annie on Friday, April 25, 2008 at 8:39pm.
(2y)^2 + 2 y^2 = 18
4 y^2 + 2 y^2 = 18
6 y^2 = 18
y^2 = 3
y = +sqrt 3 or -sqrt 3
x^2 + 2 *3 = 18
x^2 = 12
x = + or - 2 sqrt 3
20=+or-2 sqrt 3=5
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