The following system of equations is represented by the matrix equation $\text{A}\left[\begin{array} {ccc}
x \\
y \\
z \end{array} \right]=\vec{b}$.
>$\begin{align}4x+2y&=1
\\3x+7y+4z&=-4
\\8x+2z&=12\end{align}$
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[[☃ matrix 1]] | [[☃ matrix 2]]
*Represent each row and column in the order in which the variables and equations appear.*