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April 18, 2015

April 18, 2015

Posted by **RiRi** on Sunday, November 9, 2008 at 8:34pm.

xy=3

x^2+y^2=10

- math -
**drwls**, Sunday, November 9, 2008 at 9:05pmSubstitute 3/x for y in the second equation, and solve the resulting equation for x.

x^2 + 9/x^2 = 10

x^4 - 10x^2 + 9 = 0

(x^2 - 1)(x^2 - 9) =

x = 1, -1, 3 or -3.

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