1. What is the difference between a domain and a range of a relation?
A domain is the set of x-values of a relation.
A range is 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.
