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

Multiple Choice

Write a system of linear equations represented by the augmented matrix.
- $$\left[ \begin{array} { r r r | r } 1 & 0 & 0 & 7 \\0 & 1 & 0 & - 9 \\0 & 0 & 1 & \frac { 1 } { 9 }\end{array} \right]$$

A) $x = - 7$
$y = 9$
$z = - \frac { 1 } { 9 }$
B) $x = - 7$
$y = - 9$
$z = \frac { 1 } { 9 }$
C) $x = 7$
$y = 9$
$z = \frac { 1 } { 9 }$
D) $x = 7$
$y = - 9$
$z = \frac { 1 } { 9 }$