Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 3 - Section 3.4 - Linear Equations in One Variable and Problem Solving - Exercise Set - Page 198: 42

Answer

The speed of the Dodge 35 mph. The speed of the Camry is 70 mph.

Work Step by Step

Let $d$ be the speed of the Dodge. The speed of the Camry is $2d$. $d+2d=105$ $\longrightarrow$combine like terms $3d=105$ $\longrightarrow$multiplication property $3d\div3=105\div3$ $\longrightarrow$simplify $d=35$ $2d=2\times35=70$
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