Posted by **Anneliese** on Wednesday, February 25, 2009 at 2:39pm.

Solve the following system of linear equations:

2x - 3y + 6z = -12

5x + 2y - 8z = 29

7x + 6y + 4z = 49

First, I did elimination for the first two equations. I multiplied the first equation by two, and the second equation by 3.

4x - 6y + 12z = -24

+

15x + 6y - 24z = 87

That gets me:

19x - 12z = 63.

The next thing I have written down that the teacher told us is:

11x + 16z = 25

How did my teacher get to this point?

Thanks!

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