SOLUTION: 2x+y+z=9 -x-y+z=1 3x-y+z=9 I keep getting x=2 z=5 and y=0 but the solutions don't equal at the end.

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: 2x+y+z=9 -x-y+z=1 3x-y+z=9 I keep getting x=2 z=5 and y=0 but the solutions don't equal at the end.       Log On


   

Question 893681: 2x+y+z=9
-x-y+z=1
3x-y+z=9
I keep getting x=2 z=5 and y=0 but the solutions don't equal at the end.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
A=%28matrix%283%2C3%2C2%2C1%2C1%2C-1%2C-1%2C1%2C3%2C-1%2C1%29%29
abs%28A%29=8
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A%5Bx%5D=%28matrix%283%2C3%2C9%2C1%2C1%2C1%2C-1%2C1%2C9%2C-1%2C1%29%29
abs%28A%5Bx%5D%29=16
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A%5By%5D=%28matrix%283%2C3%2C2%2C9%2C1%2C-1%2C1%2C1%2C3%2C9%2C1%29%29
abs%28A%5By%5D%29=8
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A%5Bz%5D=%28matrix%283%2C3%2C2%2C1%2C9%2C-1%2C-1%2C1%2C3%2C-1%2C9%29%29
abs%28A%5Bz%5D%29=32
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x=abs%28A%5Bx%5D%29%2Fabs%28A%29=16%2F8=2
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y=abs%28A%5By%5D%29%2Fabs%28A%29=8%2F8=1
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z=abs%28A%5Bz%5D%29%2Fabs%28A%29=32%2F8=4
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