Answer
y-axis
Work Step by Step
If the x-coordinates are opposites but the y-coordinates are the same, we know that the graph has left-right symmetry, making it symmetric about the y-axis.
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 1 - 1.1 - Graphs of Equations - 1.1 Exercises - Page 78: 4
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