Use Matrices and Gauss-Jordan Elimination to Solve Systems
- $$\begin{array} { r } - 4 x + 7 y - z = 39 \\x + 6 y + 9 z = 62 \\- 5 x + y + z = - 1\end{array}$$

Multiple Choice

Use Matrices and Gauss-Jordan Elimination to Solve Systems
- $$\begin{array} { r } - 4 x + 7 y - z = 39 \\x + 6 y + 9 z = 62 \\- 5 x + y + z = - 1\end{array}$$

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