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: 19



Work Step by Step

Since $y$ is directly proportionaI to $x$, we have: $y=kx$ We are given: $y=42$ and $x=6$, so we have: $y=kx$ $42=k*6$ $k=42/6=7$ Thus the equation is: $y=7x$
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