IXL - Identify invertible functions: horizontal line test (Algebra 2 practice)

The graph below shows a function

–

also a function?

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Learn with an example

The graph below shows a function

–

also a function?

Horizontal line test

If a horizontal line intersects a function in more than one point, then its inverse is not a function.

If no horizontal line intersects the function in more than one point, then its inverse is a function.

Since there is no horizontal line that intersects

in more than one point,

–

is a function.

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