SOLUTION: Please help without using the matrix system! thank you x+y+z-w=5 2x+y-z+w=6 x-5y+3z+w=9 -x-y+z+4w=7

Question 907725: Please help without using the matrix system! thank you
x+y+z-w=5
2x+y-z+w=6
x-5y+3z+w=9
-x-y+z+4w=7

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
OK so use row operations and elimination to reduce your variables.
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Let's get rid of first.
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OK, already has eliminated, so let's pair up and to do the same.
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Finally, multiply by and add to to eliminate .
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So then,

Then work backwards,
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