Write a System of Linear Equations Represented by the Augmented $$\left[ \begin{array} { r r r | r } 4 & 9 & - 4 & - 12 \\9 & 2 & 7 & 6 \\4 & - 2 & 2 & - 1\end{array} \right]$$

Multiple Choice

Write a system of linear equations represented by the augmented matrix.
- $$\left[ \begin{array} { r r r | r } 4 & 9 & - 4 & - 12 \\9 & 2 & 7 & 6 \\4 & - 2 & 2 & - 1\end{array} \right]$$

A) $4 x + 9 y - 4 z = 12$
$9 x + 2 y + 7 z = - 6$
$4 x - 2 y + 2 z = 1$
B) $4 x + 9 y + 4 z = - 12$
$9 x + 2 y - 2 z = 6$
$- 4 x + 7 y + 2 z = - 1$
C) $4 x + 9 y - 4 z = - 12$
$9 x + 2 y + 7 z = 6$
$4 x - 2 y + 2 z = - 1$
D) $4 x = - 12$
$2 y = 6$
$2 z = - 1$