### Home > CAAC > Chapter 12 > Lesson 12.4.3 > Problem 12-90

12-90.

The graphs of several relations are shown below. Decide if each is a function. If the relation is not a function, explain why not. Homework Help ✎

A function is a relation for which each input value (*x*) has only one output value (*y*).

It is a function.

There are two *y*-values for most of the *x*-values.