Solve a System of Linear Equations in Three Variables Using $$\begin{array} { l } 3 x + 7 z = 31 \\5 x + 3 y + 2 z = 34 \\- 9 x - 5 y \quad = - 44\end{array}$$

Multiple Choice

Solve a System of Linear Equations in Three Variables Using Cramer's Rule
- $$\begin{array} { l } 3 x + 7 z = 31 \\5 x + 3 y + 2 z = 34 \\- 9 x - 5 y \quad = - 44\end{array}$$

A) $\{ ( 1,7,4 ) \}$
B) $\{ ( 7,4,7 ) \}$
C) $\{ ( 1 , - 7 , - 4 ) \}$
D) $\{ ( 2,5,4 ) \}$