SOLUTION: I need help with this problem. I have tried everthing. x+2y-z=-4 3x+y-2z=-9 2x-z=-5

Question 105788: I need help with this problem. I have tried everthing.
x+2y-z=-4
3x+y-2z=-9
2x-z=-5
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
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Let's use equation 3 to solve for z in terms of x.
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Substitute into equations 1 and 2.
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Now use equation 2 to solve for y.
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Substitute into equation 1.
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Back substitute into 2.
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Back substitute into 3.
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Check your answers.
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Good answer.
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Good answer.
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Good answer.
x=1, y=1, z=7
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