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 449: 27


$a.\quad-2$ $b.\quad 4$

Work Step by Step

The graph of a function is the set containing points $(x,f(x))$, where x is an element of the domain, and f(x) is the corresponding element of the range, meaning that we use the horizontal axis for $x$, the domain, and the vertical axis for $y=f(x)$, the range. $ a.\quad$ $(1,-2)$ is a point on the graph, so $f( 1)=-2$ $ b.\quad$ $(4,2)$ is the only point on the graph with second coordinate $2.$ So, $x=4$ is the only x for which $f(x)=2.$
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