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May 5, 2015

Homework Help: Algebra Question

Posted by mike on Friday, December 18, 2009 at 7:17pm.

I did a problem and used the substitution method and it took me forever to solve by hand. Is there a shorter way to show how this problem was done. The problem was
x+y+z=7,x-y+2z=7,2x+y+3z=15

The final answer came out to be
x=4
z=2
y=1

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