Use Matrices and Gaussian Elimination to Solve Systems
- $$\begin{aligned}5 x - y - 3 z & = - 8 \\3 x - 8 z & = - 21 \\7 y + z & = 31\end{aligned}$$

Multiple Choice

Use Matrices and Gaussian Elimination to Solve Systems
- $$\begin{aligned}5 x - y - 3 z & = - 8 \\3 x - 8 z & = - 21 \\7 y + z & = 31\end{aligned}$$

A) $\{ ( 1,4,3 ) \}$
B) $\{ ( 1,3,4 ) \}$
C) $\{ ( - 1,4,2 ) \}$
D) $\{ ( - 1,2,4 ) \}$