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Tests

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Lesson Settings & Tools

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Method

Horizontal Line Test

The Vertical Line Test determines if the graph of a relation is a function, or if each

x

-value corresponds with exactly one

y

-value. For a function to be invertible,

each y must cor exactly o - value respond to ne x - value .

This leads to the Horizontal Line Test, which is performed by moving an imaginary horizontal line across the graph of a function. If this line intersects the graph more than once anywhere, the function is not invertible.

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