Algebra
posted by Anneliese .
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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