Solved

$\left\{ \begin{array} { r } 7 x + 7 y + z = 1 \\x + 8 y + 8 z = 8 \\9 x + y + 9 z = 9\end{array} \right.$

Question 116

Multiple Choice

A) x=1, y=-1, z=1
B) x=-1, y=1, z=1
C) x=0, y=0, z=1
D) x=0, y=1, z=0

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