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# FUNCTIONS - What is a function?

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Author: Kate Sidlo
##### Description:

By the end of this tutorial students will be able to give the definition of a function verbally or in written form.

This tutorial explores what functions are using the definition "a relationship where every input has one and only one output"

The idea is demonstrated using a function machine metaphor and a table.

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Tutorial

## TO DO:

1) Take notes from the podcast video.

2) Add the definitions from the vocabulary section at the bottom to your vocabulary sheet.

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## VOCABULARY

FUNCTION: A relationship where every input has one and only one output

INPUT: A term or number that is plugged into a relationship; the x-variable in an ordered pair

RELATIONSHIP: A comparison of terms, variables, and/or numbers (typically an equation or inequality)

OUTPUT: A term or number that is the answer or solution to a relationship; the y-variable in an ordered pair