Answer
Substitution property of equality
Work Step by Step
x + x = 2x
Because they are equal, 2x can replace x + x.
x + x = 12
2x = 12
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 1 - Section 1.5 - Introduction to Geometric Proof - Exercises - Page 44: 2
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