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July 23, 2014

July 23, 2014

Posted by **Anonymous** on Thursday, August 8, 2013 at 5:13am.

3x+4y=18

12x+7y=4

Thanks!

- Math -
**Reiny**, Thursday, August 8, 2013 at 8:04am1st times 4 --> 12x + 16y = 72

2nd as is ----> 12x + 7y = 4

subtract them:

9y = 68

y = 68/9

back in 1st:

3x + 4(68/9) = 18

3x = 18 - 272/9 = -110/9

x = -110/27

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