Name Reason Is Not A Function

Nov 2019
23
2
NYC
See picture. The following relationship is not a function for three reasons:

1. Three goes to no value in y.

2. Four goes to no value in y.

3. Five goes to three values in y.

Thus, this relationship is not a function. Is my logic correct in this regard?

relation-not-function.gif
 
Dec 2014
133
103
USA
Just #3 is the reason ... reference the definition of a function.