Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 1 - Mid-Chapter Check Point: 6

Answer

Function The domain is $(-\infty, 1]$. The range is $[-1, +\infty)$.

Work Step by Step

All vertical lines will pass through the graph in at most one point. Thus, the graph represents a function. The graph covers all the x-values from $1$ to its left, therefore the domain is $(-\infty, 1]$. The graph covers all the y-values from $-1$ and above therefore, the range is $[-1, +\infty)$.
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