Use an Inverse Matrix to Find the Solution to the System

Multiple Choice

Use an inverse matrix to find the solution to the system.
- $$\left\{ \begin{array} { c } 3 x - y - 5 z = - 34 \\- 3 x + 4 y + 3 z = 37 \\9 x - 6 y + z = 21\end{array} \right.$$

A) $x = 6 , y = 9 , z = 7$
B) $x = - 6 , y = 7 , z = 12$
C) $x = 6 , y = 7 , z = 9$
D) $x = - 6 , y = 12 , z = 7$