Problem
The table below shows values for $f(x, y) . x$ values are down the side, and $y$ values are across the top. Use the table to evaluate $f(5,2)$. \begin{tabular}{|l|l|l|l|l|l|} \hline $\mathbf{y}$ & $\mathbf{1}$ & $\mathbf{2}$ & $\mathbf{3}$ & $\mathbf{4}$ & $\mathbf{5}$ \\ \hline $\mathbf{1}$ & 3 & 0 & -3 & -6 & -9 \\ \hline $\mathbf{2}$ & 8 & 5 & 2 & -1 & -4 \\ \hline $\mathbf{3}$ & 13 & 10 & 7 & 4 & 1 \\ \hline $\mathbf{4}$ & 18 & 15 & 12 & 9 & 6 \\ \hline $\mathbf{5}$ & 23 & 20 & 17 & 14 & 11 \\ \hline \end{tabular} \[ f(5,2)= \]
Solution
Step 1 ：The table shows values for $f(x, y)$. $x$ values are down the side, and $y$ values are across the top.
Step 2 ：We are asked to evaluate $f(5,2)$.
Step 3 ：Looking at the table, the value of $f(5,2)$ is $20$.
Step 4 ：So, the final answer is \(\boxed{20}\).
