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December 21, 2014

December 21, 2014

Posted by **Donald** on Thursday, July 8, 2010 at 3:59am.

2r - 9s = -17

9r + 2s = 51

- algebra -
**drwls**, Thursday, July 8, 2010 at 5:05amMultiply your first equation by -9 and the second equation by 2.

-18r + 81s = 153

18r + 4s = 102

Next, add those two equations to eliminate the "r" variable.

85s = 255

Take it from there

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