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$3$. a. Complete the table with values for $x$ or $y$ that make this equation true:$\newline$$$3 x+y=15 \text {. }$$$\newline$\begin{tabular}{|c|c|c|c|c|c|c|c|}$\newline$\hline$x$ & $2$ & $4$ & $6$ & $0$ & $3$ & $5$ & $\frac{7}{3}$ \\$\newline$\hline$y$ & $9$ & $3$ & $-3$ & $15$ & $6$ & $0$ & $8$ \\$\newline$\hline$\newline$\end{tabular}$\newline$b. Create a graph, plot these points, and find the slope of the line that goes through them.$\newline$\begin{tabular}{|l|l|l|l|l|l|l|l|l|l|l|l|l|l|l|}$\newline$\hline & & & & & & & & & & & & & & \\$\newline$\hline & & & & & & & & & & & & & & \\$\newline$\hline & & & & & & & & & & & & & & \\$\newline$\hline & & & & & & & & & & & & & & \\$\newline$\hline & & & & & & & & & & & & & & \\$\newline$\hline & & & & & & & & & & & & & \\$\newline$\hline & & & & & & & & & & & & & \\$\newline$\hline$\newline$\end{tabular}