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 given list of points not a function is 15.

In a function, each input (x-value) should correspond to exactly one output (y-value). However, in the given list of points, both x=15 and x=6 are mapped to different y-values. This violates the definition of a function.

If x=15 was not included in the list, then it would be a function.