# 3.2: Relations and Functions

Difficulty Level:

**Advanced**Created by: CK-12
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Function

Function

A function is a relation where there is only one output for every input. In other words, for every value of , there is only one value for .Relation

Relation

A relation is any set of ordered pairs . A relation can have more than one output for a given input.Vertical Line Test

Vertical Line Test

The vertical line test says that if a vertical line drawn anywhere through the graph of a relation intersects the relation in more than one location, then the relation is*not*a function.

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## Description

This concept introduces students to relations and what makes a relation a function.

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## Date Created:

Jan 16, 2013## Last Modified:

Feb 26, 2015## Vocabulary

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