Write the System of Linear Equations Represented by the Augmented $\left[ \begin{array} { r r r | r } 1 & 6 & 7 & - 3 \\ 0 & 1 & 9 & 3 \\ 0 & 0 & 1 & - 8 \end{array} \right]$

Multiple Choice

Write the system of linear equations represented by the augmented matrix. Use x, y, z, and, if necessary, w for the
variables. Then use back-substitution to find the solution.
- $\left[ \begin{array} { r r r | r } 1 & 6 & 7 & - 3 \\ 0 & 1 & 9 & 3 \\ 0 & 0 & 1 & - 8 \end{array} \right]$

A) $\{ ( - 397,75 , - 8 ) \}$
B) $\{ ( - 3,3 , - 8 ) \}$
C) $\{ ( - 17 , - 7 , - 9 ) \}$
D) $\{ ( - 473 , - 69 , - 8 ) \}$