Solved

$\left\{ \begin{array} { l } x - y + z = 8 \\x + y + z = 6 \\x + y - z = - 12\end{array} \right.$

Question 113

Multiple Choice

A) x=-2, y=-1, z=9
B) x=2, y=-1, z=-9
C) x=-2, y=-1, z=-9
D) x=2, y=-1, z=9

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