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December 21, 2014

December 21, 2014

Posted by **asia** on Thursday, January 21, 2010 at 10:58pm.

- math -
**ALan**, Thursday, January 21, 2010 at 11:20pmIsolate x or y in either equation and then subsitute it in to the other equation.

x+y=56

x=56-y

Subsitute into the other equation:

Since x=56-y, the other equation becomes (56-y)+3y=56

56+2y=56 subtract 56 from both sides

2y=0

y=0/2

y=0

then x must be 56

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