Answer
$3y+9x$
Work Step by Step
The commutative law of addition states that $a+b=b+a$ (where $a$ and $b$ are real numbers). That is, changing the order of addition does not affect the answer.
Therefore, $9x+3y=3y+9x$.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 1 - Introduction to Algebraic Expressions - 1.2 The Commutative, Associative, and Distributive Laws - 1.2 Exercise Set - Page 16: 15
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