The inverse of a function f is also a function
if and only if no horizontal line intersects the
graph of f more than once.
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Step-by-step explanation:
The graph of inverse functions are reflections over the line y = x. This means that each x-value must be matched to one and only one y-value. ... A function f is one-to-one and has an inverse function if and only if no horizontal line intersects the graph of f at more than one point.
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