True or false : If every horizontal line intersects the graph of a function f at most once, then f is a one-to-one function. If a function f is one-to-one, then an inverse function f-1 exists.

Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter2: Functions
Section2.8: One-to-one Functions And Their Inverses
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True or false :

  1. If every horizontal line intersects the graph of a function f at most once, then f is a one-to-one function.
  2. If a function f is one-to-one, then an inverse function f-1 exists.
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