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Graphs, Functions, and Sequences$\newline$Identifying proportional relationships in tables by calculating unit rates:...$\newline$For each table, determine whether it shows that $x$ and $y$ are proportional.$\newline$If $x$ and $y$ are proportional, fill in the blank with a number in simplest form.$\newline$\begin{tabular}{|c|c|c|c|c|c|c|c|}$\newline$\hline \multicolumn{$4$}{|c|}{ Table $1$} & \multicolumn{$4$}{|c|}{ Table $2$} \\$\newline$\hline \multirow[t]{$2$}{*}{$x$} & $18$ & $24$ & $7$ & $x$ & $3$ & $4$ & $7$ \\$\newline$\hline & $3$ & $4$ & $42$ & $y$ & $6$ & $12$ & $28$ \\$\newline$\hline \multicolumn{$4$}{|c|}{ Proportional } & \multicolumn{$4$}{|c|}{ Proportional } \\$\newline$\hline \multicolumn{$4$}{|c|}{$y$ is $\square$ times $x$} & \multicolumn{$4$}{|c|}{$y$ is $\square$ times $x$} \\$\newline$\hline \multicolumn{$4$}{|c|}{ Not proportional } & \multicolumn{$4$}{|c|}{ Not proportional } \\$\newline$\hline$\newline$\end{tabular}