Question

Which graph shows a function whose inverse is also a function?

Answer 1

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HERE IS YOUR ANSWER____!!!

A function has an Inverse Function if and only if there is no any horizontalstraight line that intersects the graph of at more than one point. A function is one-to-one if each value of corresponds to exactly one value of 

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Answer 2

In general,

A function graph must not pass above or below itself.

Therefore, for its inverse to be a function, it must not

pass either to the right or left of itself.

Or ---

A function graph must pass the vertical line test. That is,

no vertical line can intersect the graph more than once.

Therefore, in order for a function to have an inverse which

is also a function, its graph must pass the horizontal line

test. That is, no horizontal line can intersect the graph

more than once.