Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 2 Linear Equations and Functions - Chapter Review - Exercises - Page 143: 22


See below.

Work Step by Step

If the variables vary directly, then $T=aV$ for some constant $a$. Plugging in the given values, here $300=a\cdot4.8\\a=62.5$. Thus the equation is: $T=62.5V$. Thus if $T=420$, then $420=62.5V\\V=\frac{420}{62.5}=6.72$
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