Use Matrices and Gauss-Jordan Elimination to Solve Systems
Solve the System

Multiple Choice

Use Matrices and Gauss-Jordan Elimination to Solve Systems
Solve the system of equations using matrices. Use Gauss-Jordan elimination.
- $$\begin{array} { r } - 4 x - y - 3 z = - 39 \\7 x + 8 y - 4 z = 35 \\3 x - 2 y + z = - 4\end{array}$$

A) $\{ ( 1,8,9 ) \}$
B) $\{ ( 1,9,8 ) \}$
C) $\{ ( - 1,8,2 ) \}$
D) $\{ ( 2,8 , - 1 ) \}$