College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 1, Equations and Graphs - Section 1.10 - Modeling Variation - 1.10 Exercises - Page 164: 23


$A= \frac{18x}{t}$

Work Step by Step

Since $A$ is directly proportionaI to $x$ and inversely proportional to $t$, we have: $A=\frac{kx}{t}$ We are given: $A=42$ and $x=7$ and $t=3$, so we have: $42= \frac{k*7}{3}$ $k=42*3/7=18$ So the equation is: $A= \frac{18x}{t}$
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