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December 20, 2014

December 20, 2014

Posted by **ki** on Wednesday, February 13, 2013 at 8:16pm.

- math -
**JJ**, Wednesday, February 13, 2013 at 8:29pmx + y =90

x-y = 18

Add the two equations together which will eliminate y.

Solve for x and then substitute the value for x into the first equation to find y. check the x and y values in both equations to be sure you are correct.

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