Answer
Quadrant I and Quadrant III
Work Step by Step
The product $xy$ will be positive when $x$ and $y$ have the same sign.
Points in Quadrant I and Quadrant III have coordinates with the same signs so the product $xy$ will be positive.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 1 - Section 1.1 - Graphs and Graphing Utilities - Exercise Set - Page 160: 75
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