**1. What is the difference between a domain and a range of a relation?**

A

domainis the set of x-values of a relation.A

rangeis the set of y-values of a relation.

**2. Under what circumstances is a relation not a function?**

When a member of the domain is related to more than one member of the range.

e.g. { ( 1, 2), (1, 3) }

**3. Which axis of a graph shows the domain of a function?**

The x-axis shows the domain and the y-axis shows the range.