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Posted by Annie on Friday, April 25, 2008 at 8:39pm.

Find the exact solutions of the systems of equation x^2+2y^2=18 and x=2y

(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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