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$\begin{tabular}{|c|c|} \hline X & y \\ \hline<br/>1 & 5 \\ \hline<br/>2 & 7 \\ \hline<br/>3 & 9 \\ \hline<br/>4 & 11 \\ \hline \end{tabular}$ The table above shows some pairs of $x$ values and $y$ values. Which of the following equations could represent the relationship between $x$ and $y$ ?