SOLUTION: -5x - 4y + 12z = -140 9x - 8y + z = -649 3x - 2y + 6z = -290 I need to solve this using any method. Id like to see the steps and the correct answer. I think mabye i should

Question 160518: -5x - 4y + 12z = -140
9x - 8y + z = -649
3x - 2y + 6z = -290

I need to solve this using any method. Id like to see the steps and the correct answer. I think mabye i should start by multiplying the 3rd equation by 3 and then subtract it from the 2nd equation? I'm trying to make sence of this but i just cant figure it out. I really appericiate your time, thank you.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
1.
2.
3.
How about instead we get rid of y first.
The z coefficients (-4,-8,-2) might be eaiser to start with.
Multiply eq. 1 by -2 and eq. 3 by -4 and add to eq. 2,

5.
.
.
.
Multiply eq. 5 by (-1) and add to eq. 4 to get rid of z.

From eq. 4,
4.

Finally, from eq. 1,
1.

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