SOLUTION: 5x+8y-z=36 x-2y+7z=18 3x+y+z=21

Algebra.Com
Question 1097901: 5x+8y-z=36
x-2y+7z=18
3x+y+z=21

Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
I would use eliminataion.
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Eliminate z first.
Add the 1st and 3rd equations.
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then, multiply eqn 1 by 7 and add to eqn 2.
No more z
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Actually, I have an Excel sheet I made that does these.
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