Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 7 - Functions and Graphs - 7.1 Introduction to Function - 7.1 Exercise Set - Page 448: 10


Not a function.

Work Step by Step

A function is a correspondence between a first set, called the domain, and a second set, called the range, such that EACH member of the domain corresponds to EXACTLY ONE member of the range. --- Keywords are emphasized. We see from the graphical definition of the correspondence that 2 from the domain has more than one corresponding value in the range (a and b). So, the "exactly one" clause has been violated. Not a function. Note: The same clause is violated for 4 from the domain.
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