Answer
Perpendicular
Work Step by Step
The slopes ($3 \ and \ -\frac{1}{3}$) are opposite reciprocals, so the two lines are perpendicular.
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 1 - Linear Functions and Change - Review Exercises and Problems for Chapter One - Page 54: 19
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