Write the System of Equations Associated with the Augmented Matrix $\left[\begin{array}{rrr|r}1 & 0 & 0 & 6 \\ 0 & 1 & 0 & -7 \\ 0 & 0 & 1 & 9\end{array}\right]$

Multiple Choice

Write the system of equations associated with the augmented matrix. Do not solve.
- $\left[\begin{array}{rrr|r}1 & 0 & 0 & 6 \\ 0 & 1 & 0 & -7 \\ 0 & 0 & 1 & 9\end{array}\right]$

A) $x=6$
$y=-7$
$\mathrm{z}=9$
B) $x=0$
$y=-1$
$\mathrm{z}=15$
C) $x=-3$
$y=-16$
$\mathrm{z}=0$
D) $x=-6$
$\mathrm{y}=7$
$\mathrm{z}=-9$