# How do you know if a graph is one to one

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## Identify Functions Using Graphs

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## 1 One-To-One Functions

Here's the easy way: The Horizontal Line Test: If you can draw a horizontal line so that it hits the graph in more than one spot, then it is NOT one-to-one. Check it out: Is one-to-one? continue 1 2 3

## Lecture 1 : Inverse functions One-to-one Functions A function f

Use the vertical line test to determine whether the following graph represents a function. Solution : Drawing a vertical lines across the graph, we get In the above graph, the vertical line

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## One-to-One Functions

How to determine if a function represented by a graph is a one-to-one function