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December 21, 2014

December 21, 2014

Posted by **jay jay** on Tuesday, July 8, 2008 at 12:17am.

4x-9y=18.5

7y-2x=-10.5

- algebra -
**drwls**, Tuesday, July 8, 2008 at 1:25amRewrite the second equation

-2x + 7y = -10.5 Now double it.

-4x + 14y = -21

Now add that to the first of your equations

5y = -2.5

y = -0.5

4x + 4.5 = 18.5

4x = 14

x = 3.5

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