Solve the System of Equations by Using the Inverse of the Coefficient

Multiple Choice

Solve the system of equations by using the inverse of the coefficient matrix.
- $$\begin{array}{l}9 x-2 y+5 z=78 \\2 x+3 y-9 z=-50 \\3 x-8 y+6 z=49\end{array}$$

A) $(6,-1,7)$
B) $(1,7,1)$
C) $(5,-1,-7)$
D) $(5,1,7)$