Question In the relation in the table below, write a value that will make the relation not represent a function. \begin{tabular}{c|cccc} Input & -1 & $?$ & 6 & 4 \\ \hline Output & 5 & 3 & 13 & 9 \end{tabular} Provide your answer below:

Step 1 ：A function is a relation in which each input has exactly one output. In other words, no two different ordered pairs in the function have the same first element.

Step 2 ：Therefore, to make the relation not represent a function, we need to choose a value for the question mark that is already an input in the table.

Step 3 ：Looking at the table, we see that the inputs are -1, 6, and 4. We can choose any of these values to make the relation not represent a function.

Step 4 ：We can choose any of the existing inputs to make the relation not represent a function. Therefore, the final answer could be -1, 6, or 4. For example, we can choose \(\boxed{-1}\).