[tex]\left[\begin{array}{ccc}0&-1\\-3&1\end{array}\right][/tex]
-y
-2x + y
- y determinant
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[tex]\left[\begin{array}{ccc}2&0\\1&-3\end{array}\right][/tex]
2x
x-3y
- x determinant
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[tex]\left[\begin{array}{ccc}2&-1\\1&1\end{array}\right][/tex]
2x -y
x + y
-system determinant
