SOLUTION: Can someone please show me step by step on this please...I did it but I am off 1 number..I appreciate the time. Use matrix form and Gaussian elimination method to solve the line

Question 368368: Can someone please show me step by step on this please...I did it but I am off 1 number..I appreciate the time.
Use matrix form and Gaussian elimination method to solve the linear system
4x+8y-4z=4
3x+8y+5z= -11
-2x+y+12z= -17

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

1.
2.
3.
Multiply eq. 1 by (-3) and add to eq. 2,

4.
Multiply eq. 1 by (2) and add to eq. 3,

5.
Subtract eq. 5 from eq. 4,

Then from eq. 4,

Then from eq. 1,

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