We have the following:
[tex]\begin{gathered} 9x-4y-5z=9 \\ 7x+4y-4z=-1 \\ 6x-6y+z=-5 \end{gathered}[/tex]
therefore, the matrix is:
[tex]\left|\begin{bmatrix}{9} & {-4} & {-5} \\ {7} & {4} & {-4} \\ {6} & {-6} & {1}\end{bmatrix}\right?=\left\{ \begin{aligned}9 \\ -1 \\ -5\end{aligned}\right.[/tex]
the answer is the option A
