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April 23, 2014

April 23, 2014

Posted by **ale** on Tuesday, October 16, 2012 at 12:52am.

- math -
**Reiny**, Tuesday, October 16, 2012 at 9:11amAre solving ?

1st times 4 ----> 8x + 20y = 40

2nd times 5 ---> -35x - 20y = 80

add them

-27x = 120

x = -40/9

into the 1st:

-80/9 + 5y = 10

-80 + 45y = 90

45y =170

y = 34/9

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