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 197: 30


Life expectancy: chimp 53 years elephant 77 years

Work Step by Step

Let $x$ be life expectancy for a chimp. Life expectancy for an elephant is $x+24$. $x+x+24=130$ $\longrightarrow$combine like terms $2x+24=130$ $\longrightarrow$addition property $2x+24-24=130-24$ $\longrightarrow$simplify $2x=106$ $\longrightarrow$multiplication property $2x\div2=106\div2$ $\longrightarrow$simplify $x=53$ $x+24=53+24=77$
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