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QUESTION
Horizontal Line Test If some horizontal line intersects the graph of the function more than once, then the function is not one-to-one.
Horizontal Line Test If some horizontal line intersects the graph of the function more than once, then the function is not one-to-one. If no horizontal line intersects the graph of the function more than once, then the function is one-to-one. Jiwen He, University of Houston Math 1432 What are One-To-One Functions?
