The given system of equations is:
\[
\begin{aligned}
2x - 4y + z &= -46, \\
-x + y - z &= 18, \\
x - 2y &= -20.
\end{aligned}
\]
We can write this system in matrix form \(AX = B\) where:
\[
A = \begin{bmatrix} 2 & -4 & 1 \\ -1 & 1 & -1 \\ 1 & -2 & 0 \end{bmatrix},
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