Answer
$36$.
Work Step by Step
Step 1. As x varies directly as y, we have $y=kx$ where $k$ is a constant.
Step 2. As $x=12$ when $y=4$, we have $4=k(12)$, thus $k=\frac{1}{3}$
Step 3. For $y=12$, we have $12=\frac{1}{3}x$. thus $x=36$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 3 - Polynomial and Rational Functions - Chapter 3 Test Prep - Review Exercises - Page 402: 88
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