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A function is an equation that does not repeat any x values.

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a function is a graph that has no repeating domains

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passes the vertical line test

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A set of points that correspond with a graph

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An equation that passes the vertical line test.

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A function has a set of domain and range. One input has exactly one output

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a function is a equation that has a specific set of range and domain with no repeating domains possible.

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All functions must pass the vertical line test.
A function has a set of input and output values that do not repeat.

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A function is an equation that gives a value based on the input, and when graphed, has no repeating domains.

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A function is an equation for which every input has exactly one output. 

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A function is an equation for which every input has exactly one output. 

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a function has a set of domains and ranges in a graph

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A function is an equation with at least one variable and no repeating values.

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A function is an equation with at least one variable and no repeating values.

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An equation that

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a function is a either a set of values that do not repeat in the domain, an equation that when graphed has no repeating domains.

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A function is an equation that has a graph with no repeating domains. There are numerous "parent functions" that are used to make more specific, complicated functions.

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A function relates an input to an output. Every input only have one output to passed the vertical tewt