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Chapter 2: Problem 49

What is the horizontal line test and what does it indicate?

Short Answer

Expert verified
The horizontal line test is a method used to determine whether a function has an inverse that is also a function. This is done by imagining or drawing a horizontal line on the graph of the function and moving it up and down along the y-axis. If the line intersects the function more than once at any point, the function does not pass the test, indicating it does not have an inverse that is also a function.

Step by step solution

01

Definition of the Horizontal Line Test

The horizontal line test is a method that can determine whether a function has an inverse that is also a function. The horizontal line test involves imagining or drawing a horizontal line on the graph of the function. This horizontal line is often referred to as the 'test line'.
02

Application and Indication of the Horizontal Line Test

To perform the horizontal line test, the test line is moved up and down along the y-axis. If at any point the test line crosses the function more than once, the function fails the horizontal line test. This indicates that the function does not have an inverse that is also a function.
03

Conclusion

In conclusion, the horizontal line test is a method to determine if a function has an inverse that is also a function. The test line must never cross the function more than once, otherwise, the function will fail the test.

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