Functions Modeling Change: A Preparation for Calculus, 5th Edition

Published by Wiley
ISBN 10: 1118583191
ISBN 13: 978-1-11858-319-7

Chapter 2 - Functions - Strengthen Your Understanding - Page 114: 23

Answer

False.

Work Step by Step

Assume that for $y=\frac{x}{|x|}$, $y=1$ for all $x\ne0$ in the real numbers. Therefore, $y$ should equal $1$ for $x=-1$. At $x=-1$, $$y=\frac{-1}{|-1|}=\frac{-1}{1}=-1$$ This y-value isn't equal to $1$, though it is a real number not equal to zero. Therefore, by contradiction, the statement is false.
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