Precalculus (6th Edition) Blitzer

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


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.
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