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November 20, 2014

November 20, 2014

Posted by **GLORIA** on Friday, July 2, 2010 at 9:41am.

- ALGEBRA II -
**drwls**, Friday, July 2, 2010 at 10:21amSolve

x + y = 8.5 together with

xy = 18.

Try a substitution method,

y = 18/x

x + 18/x = 8.5

x^2 -8.5x + 18 = 0

(x-4)(x-4.5) = 0

Take it from there

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