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December 20, 2014

December 20, 2014

Posted by **Kim** on Thursday, March 11, 2010 at 12:04am.

1/5x -1/4 y = 3

2/5x + 1/2y = 2

- Algebra -
**Reiny**, Thursday, March 11, 2010 at 12:14amfirst one times 20

4x - 5y = 60

second one times 10

4x + 5y = 20

add them

8x = 80

x = 10

in 4x + 5y = 20

if x = 10, y = -4

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