College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 2, Functions - Chapter 2 Review - Exercises - Page 267: 11


(b) and (c) are functions (c) is a one-to-one function

Work Step by Step

To check if a graph is a function, we use the vertical line test. Graphs (b) and (c) pass the vertical line test, so they are functions. To check if a graph is one-to-one, we use the horizontal line test. Graphs (c) and (d) pass the horizontal line test, but only (c) is a function. So (c) is the only one-to-one function.
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