Write the System of Linear Equations Represented by the Augmented $\left[ \begin{array} { r r r r | r } 1 & 1 & - 1 & 1 & - 3 \\ 0 & 1 & - 4 & 4 & 0 \\ 0 & 0 & 1 & 6 & 17 \\ 0 & 0 & 0 & 1 & 7 \end{array} \right]$

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.
- $\left[ \begin{array} { r r r r | r } 1 & 1 & - 1 & 1 & - 3 \\ 0 & 1 & - 4 & 4 & 0 \\ 0 & 0 & 1 & 6 & 17 \\ 0 & 0 & 0 & 1 & 7 \end{array} \right]$

A) $\{ ( 93 , - 128 , - 25,7 ) \}$
B) $\{ ( - 3,0,17,7 ) \}$
C) $\{ ( - 5 , - 1,10,6 ) \}$
D) $\{ ( 7 , - 25 , - 128,93 ) \}$