SOLUTION: Solve using Matrices -4x=12 -2x+y-2z=1 2x+2y+2z=8

Question 1051700: Solve using Matrices
-4x=12
-2x+y-2z=1
2x+2y+2z=8

Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Simplified form of the system:

I will let YOU do the last row operation. It should be add some multiple of row 3 to row 2 to eliminate the coefficient on z.
How do you start with 3 and get 2?

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Row 3 to be used as ,

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The operation to do then is to change row 2 according to .

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