Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 2 - Functions, Equations, and Graphs - 2-2 Direct Variation - Practice and Problem-Solving Exercises - Page 71: 26


13.5 minutes

Work Step by Step

We can represent the wasted water as $x$ and the minutes as $y$. $x=3y$ because one cup is wasted every 3 minutes. We want to know what $y$ will be if $x$ is multiplied by 4.5 (4.5 cups wasted). So, we multiply $3y$ by 4.5. $4.5x=13.5y$ So, it takes 13.5 minutes to waste 4.5 cups of water.
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