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A relation with no repeating x-values such that there is exactly one output for each input.
Lists the inputs and outputs in order drawing arrows from the inputs to their outputs.
Vertical Line Test
A visual test on a graph to determine if the relation is a function. If this line passes through more than one point, then it is not a function.
Written as f(x), is read as "f of x", and represents the value of y given a value of x.
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