Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 1 - Section 1.1 - Introduction to Algebra: Variables and Mathematical Models - Exercise Set - Page 11: 76



Work Step by Step

"$5$ times $y$" $\rightarrow 5y$, "$2$ more than $5$ times $y$" $\rightarrow 2+5y$, "$x$ is $2$ more than $5$ times $y$" $\rightarrow x=2+5y$ If $y=4$, we calculate x from the last equation, $x=2+5(4)=2+20=22.$ To evaluate the expression, replace x with $22$ and y with $4$: $\displaystyle \frac{x-y}{3}=\frac{22-4}{3}=\frac{18}{3}=6$
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