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# 1.12: Functions that Describe Situations

Difficulty Level: Basic Created by: CK-12
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### Vocabulary Language: English Spanish

dependent variable

A dependent variable is one whose values depend upon what is substituted for the other variable.

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 $y$.

independent variable

The independent variable is the variable which is not dependent on another variable. The dependent variable is dependent on the independent variable.

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 $f(x) = x^2 + 3$.

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