Determine Whether the Table Defines Y as a Function of X

True/False

Determine whether the table defines y as a function of x .
$\begin{array}{|c|c|} \hline\text { x } & \text { y } \\ \hline 1& 5 \\2 &14 \\3& 25\\4&17 \\1 & 9 \\\hline\end{array}$