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# FUNCTIONS - Independent & Dependent Variables

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Author: Kate Sidlo
##### Description:

By the end of this tutorial you will be able to identify independent and dependent variables from a graph, equation, ordered pair, and word problem.

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Tutorial

## TO DO:

1) Take notes from podcast

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## VOCABULARY:

DEPENDENT: A variable that is changed based on another variable. Y-variable.

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

INDEPENDENT: A variable that is changed by choice. X-Variable.

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

VERTICAL LINE TEST: A test that uses vertical lines to check if a graph is a function. Each vertical line can intersect a graph only once for a graph to be a function.