Use Matrices and Gaussian Elimination to Solve Systems
- $$\begin{aligned}x + y + z & = 2 \\x - y + 5 z & = - 4 \\2 x + y + z & = 7\end{aligned}$$

Multiple Choice

Use Matrices and Gaussian Elimination to Solve Systems
- $$\begin{aligned}x + y + z & = 2 \\x - y + 5 z & = - 4 \\2 x + y + z & = 7\end{aligned}$$

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