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If $\; A=\begin{bmatrix} 1 & 2 & x \\[0.3em] 3 & -1 & 2\end{bmatrix}\;$ and $\; B=\begin{bmatrix} y & x & 1\end{bmatrix}\;$ be such that $\;AB= \begin{bmatrix} 6 \\[0.3em] 8 \end{bmatrix}\;$ , then :

$(a)\;y=2x \qquad(b)\;y=-2x\qquad(c)\;y=x\qquad(d)\;y=-x$

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