**Relation**

A collection or set of ordered pairs is called a **relation**. Although a relation is almost always expressed as a set of ordered pairs, they can also be represented in table format, mapping diagram, and a graph on an XY-plane.

Below is an example of a relation expressed in four ways:

**Set of ordered pairs**

{(-2, 1), (0, 2), (3, 4), (3, -3), (4, 0), (6, -2)}

**Table**

**Mapping Diagram**

**Graph on an XY-plane**