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# 7.20: Linear and Non-Linear Patterns of Change

Difficulty Level: At Grade Created by: CK-12
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### Vocabulary Language: English

Function

Function

A function is a relation where there is only one output for every input. In other words, for every value of $x$, there is only one value for $y$.
Function Rule

Function Rule

A function rule describes how to convert an input value ($x$) into an output value ($y$) for a given function. An example of a function rule is $f(x) = x^2 + 3$.
Linear Function

Linear Function

A linear function is a relation between two variables that produces a straight line when graphed.
Non-Linear Function

Non-Linear Function

A non-linear function is a function that does not form a line when graphed.

Nov 30, 2012

May 09, 2015