Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 2 - Solving Equations - 2-1 Solving One-Step Equations - Practice and Problem-Solving Exercises: 79

Answer

(A) 12

Work Step by Step

From the problem, we know Luis raised 21 dollars, earning 1.75 dollars for every mile (x) he ran: $1.75\times x=21$ We can now isolate $x$ by dividing both sides of the equation by $1.75$: $(1.75\times x)/1.75=21/1.75$ $x=12$
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