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: 34

Answer

The cost of Madden NFL 13 is \$17. The cost of Call of Duty:Black Ops 2 is \$30.

Work Step by Step

Let $m$ be the cost of Madden NFL 13. The cost of Call of Duty:Black Ops 2 is $m+13$. $m+(m+13)=47$ $\longrightarrow$combine like terms $2m+13=47$ $\longrightarrow$addition property $2m+13-13=47-13$ $\longrightarrow$simplify $2m=34$ $\longrightarrow$multiplication property $2m\div2=34\div2$ $\longrightarrow$simplify $m=17$ $m+13=17+13=30$
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