Question

solve the system using a matrix equation: -2x+y+2z=-13 , -x-4y+z=-11 , -y-z=0

Answer 1

\[\begin{bmatrix}
-2&1&2\\
-1&-4&1\\
0&-1&-1
\end{bmatrix}\begin{bmatrix}x\\y\\z\end{bmatrix}=\begin{bmatrix}-13\\-11\\0\end{bmatrix}\]