Answer
$y=7.5x$
Work Step by Step
If y varies directly with x, then $y=kx$, for some constant k.
Given x=4, y=30, we find k
$ 30=k\cdot 4\qquad$ ... divide with 4
$7.5=k$
So,
$y=7.5x$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 7 - Functions and Graphs - Review Exercises: Chapter 7 - Page 497: 43
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