Answer
$y=kx$
Work Step by Step
If $y$ is directly proportional to $x$, the $y=kx$ where $k$ is the constant of proportionality.
Thus, the missing expression in the given statement is $y=kx$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 1 - Functions and Their Graphs - Section 1.7 Building Mathematical Models Using Variation - 1.7 Assess Your Understanding - Page 109: 1
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