2x-y 3z=-1;-4x 2y-6z=2 by gauss elimination and back substitution

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- Sep 14th 2010, 10:30 PMsoniElimination Method
2x-y 3z=-1;-4x 2y-6z=2 by gauss elimination and back substitution

- Sep 14th 2010, 10:50 PMUnknown008
Could you re-post your equations? There are two equations with three unknowns and the '+' signs didn't appear, if there were any.

- Sep 14th 2010, 10:53 PMEducated
1.

2.

I'm guessing it's a +2y and +3z

Here, double equation 1, to get

Or conversely you could halve equation 2.

Then you have:

1.

2.

Wait... here I find that both equations are the exact same... You can't solve a simultaneous eauation if both of them are the same.