Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 4 - An Introduction to Functions - 4-6 Formalizing Relations and Functions - Lesson Check - Page 271: 7


The student is not correct, for this is not a function.

Work Step by Step

In order to pass the vertical line test, we must be able to put a vertical line anywhere on the graph and not have it intersect the curve on the graph multiple times. However, the student only considers one spot on the graph. A vertical line at x=3, for instance, intersects the curve multiple times, so this is not a function.
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