What is the largest value of x that would make the following list of a points not a function?

{(__,15), (6,22), (15,24)}

The largest value of x that would make the list of points not a function is 15.

In the given list of points, there are two points with x = 15 but different y-values (24 and 15). For the list to represent a function, each x-value must correspond to only one y-value. Therefore, if x = 15 had the same y-value in both points, then the list would be a function.