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$$\begin{cases} 3x - 2y + z = 8 \\ 4x - y + 3z = -1\\ 5x + y + 2z = -1 \end{cases}$$

Form two equations with y elimanted.

It would be really helpful too see what you guys wrote.

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    This strikes me as bizarre: Why not just solve the system of linear equations as usual, and write x=[solution for x] and z=[solution for z] as your two equations?2012-10-26

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