Practice problem

When Is a Relation a Function?

+2 contributors

Contributors

\begin{array}{|ccc|} \hline a&b&c\\ \begin{array}{|c|c|} \hline x&y\\ \hline 2&3\\ 6&10\\ 13&10\\ \hline \end{array} & \begin{array}{|c|c|} \hline x&y\\ \hline 2&3\\ 6&10\\ 6&14\\ \hline \end{array} & \begin{array}{|c|c|} \hline x&y\\ \hline 2&3\\ 6&10\\ 13&14\\ \hline \end{array}\\ \hline \end{array}

Select all of the following tables which represent $y$ as a function of $x$ .