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May 4, 2015

Homework Help: algebra 2

Posted by john on Sunday, October 7, 2012 at 1:29pm.

i'm trying to solve this system of equations with 3 variables
5a-b+3c=5
2a+7b-2c=5
4a-5b-7c=-65

i tried to make the first equation like
a=something
so i could substitute it in to the 2nd equation, however i get decimals so it doesnt work
how do i do this problem?

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