Answer
y = -2b
Work Step by Step
Points A and B have symmetry with respect to a vertical
line (x = a) or a horizontal line (y = b). To give an equation
like x = 3 for the axis of symmetry for:
A(a,0) and B(a,2b)
The equation will be y = -2b
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 10 - Section 10.1 - The Rectangular Coordinate System - Exercises - Page 456: 19b
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