Question 1055719: x-5y-2z=6
-5x-5y+z=9
2x+5y-4z=-3
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! Same problem, different numbers.
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3x-4y-z=6
2x-y+z=-1
4x-7y-3z=13
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I would use elimination.
Add eqns 1 and 2 --> an eqn in x & y (z is eliminated).
Multiply eqn 2 by 3, than add eqn 3.
--> a 2nd eqn in x & y.
etc.
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Eliminate y first, since all terms have the same coefficient.
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