Use Matrices to Solve the System $$\left\{ \begin{array} { r r } 2 x - y - 9 z & = - 33 \\- 8 x - 3 z & = - 71 \\2 y + z & = 9\end{array} \right.$$

Multiple Choice

Use matrices to solve the system.
- $$\left\{ \begin{array} { r r } 2 x - y - 9 z & = - 33 \\- 8 x - 3 z & = - 71 \\2 y + z & = 9\end{array} \right.$$

A) $( 7,5,2 )$
B) $\varnothing$
C) $( 7,2,5 )$
D) $( - 7,2,14 )$