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March 28, 2015

March 28, 2015

Posted by **Barney** on Sunday, July 24, 2011 at 8:32pm.

0.3x-0.2y=4

0.4x+0.3y=49/23

- math -
**Reiny**, Sunday, July 24, 2011 at 9:39pm1st one by 30 ----> 9x - 6y = 120

2nd by 20 -------> 8x +6y = 980/23

add them

17x = 3740/23

x = 220/23

back into 8x + 6y = 980/23

1760/23 + 6y = 980/23

6y = -780/23

y = -130/23

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