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If $(\begin{matrix} 3 & - 2 \\ - 1 & 2 \end{matrix}) (\begin{matrix} x \\ y \end{matrix}) = (\begin{matrix} 11 \\ - 5 \end{matrix}),$ then $3 x + 7 y =$

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Correct option is C

3−2−12xy=11−5,3x−2y=11,−x+2y=−5 ⇒x=3,y=−1⇒3x+7y=9−7=2

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If 3−2−12xy=11−5, then 3x+7y=

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If $(\begin{matrix} 3 & - 2 \\ - 1 & 2 \end{matrix}) (\begin{matrix} x \\ y \end{matrix}) = (\begin{matrix} 11 \\ - 5 \end{matrix}),$ then $3 x + 7 y =$