(See) Find x and y so
Question: Find x and y so
\[\left[ \begin{matrix} x & -1 \\ 1 & 0 \\ \end{matrix} \right]\left[ \begin{matrix} 2 & 1 \\ 4 & 1 \\ \end{matrix} \right]=\left[ \begin{matrix} y & 7 \\ y & -6 \\ \end{matrix} \right]\]
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