Answer
Half-planes.
Work Step by Step
One region when the $xy$-plane is separated into two regions by a line is a half-plane.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 11 - Systems of Equations and Inequalities - 11.7 Systems of Inequalities - 11.7 Assess Your Understanding - Page 783: 8
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