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$\begin{tabular}{|c|c|} \hline $x$ & $y$ \\ \hline<br/>0 & 18 \\ \hline<br/>1 & 13 \\ \hline<br/>2 & 8 \\ \hline \end{tabular}$ The table shows three values of $x$ and their corresponding values of $y$. There is a linear relationship between $x$ and $y$. Which of the following equations represents this relationship?