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Terms
Domain
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The set of all inputs of a relation or function.
Function
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A relation in which each input has only one output. Often denoted f (x).
Horizontal Line Test
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If every horizontal line you can draw passes through only 1 point, x is a
function of y. If you can draw a horizontal line that passes through 2
points, x is not a function of y.
Range
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The set of all outputs of a relation or function.
Relation
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A set of inputs and outputs, often written as ordered pairs (input, output).
Restricted Domain
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The domain of a function that is not defined for all real numbers.
Vertical Line Test
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If every vertical line you can draw goes through only 1 point, y is a function
of x. If you can draw a vertical line that goes through 2 points, y is not
a function of x.
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