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Determine whether the curve is the graph of a function of x. If it is, state the domain and range of the function.

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No, the curve is not the graph of a function because a vertical line intersects the curve more than once. Hence, the curve fails the Vertical Line Test.

00:50

Jeffrey Payo

Calculus 1 / AB

Calculus 2 / BC

Calculus 3

Chapter 1

Functions and Models

Section 1

Four Ways to Represent a Function

Functions

Integration Techniques

Partial Derivatives

Functions of Several Variables

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University of Michigan - Ann Arbor

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okay. Is this the graph of a function? Well, remember that a function must pass the vertical line test, which means that for every X value there's only one y value. So if you pass a vertical line through, it can only pass through one point. This vertical line passes through only one point, and so does this one. However, this vertical line passes through multiple points, as does this one and this one. And even though there are some vertical lines that pass through only one point, if there exists any vertical lines that pass through multiple points, it's not a function.

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