The Matrix Is the Reduced Echelon Matrix for a System $$\left[ \begin{array} { r r r r | r } 1 & 0 & 0 & 0 & 0 \\0 & 1 & 0 & 0 & - 8 \\0 & 0 & 1 & 0 & 0 \\0 & 0 & 0 & 1 & - 9\end{array} \right]$$

Multiple Choice

The matrix is the reduced echelon matrix for a system with variables x 1 , x 2 , x 3 , and x 4 . Find the solution set of the system. $$\left[ \begin{array} { r r r r | r } 1 & 0 & 0 & 0 & 0 \\0 & 1 & 0 & 0 & - 8 \\0 & 0 & 1 & 0 & 0 \\0 & 0 & 0 & 1 & - 9\end{array} \right]$$

A) ( $-$ 3, $-$ 10, 2, $-$ 12)
B) (0, $-$ 10, 0, $-$ 12)
C) (3, $-$ 8, $-$ 2, $-$ 9)
D) (0, $-$ 8, 0, $-$ 9)
E) inconsistent