Solved

$\left\{ \begin{array} { c } x + y + z = 7 \\x - y + 2 z = 7 \\5 x + y + z = 11\end{array} \right.$

Question 15

Multiple Choice

A) x=4, y=1, z=2
B) x=1, y=2, z=4
C) x=1, y=4, z=2
D) x=4, y=2, z=1

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