Answer
$d=\frac{l}{f}$
Work Step by Step
Multiply $d$ to both sides of the equation:
$d \cdot f=d \cdot \frac{l}{d}
\\df = l$
Divide $f$ to both sides of the equation:
$\frac{df}{f}=\frac{l}{f}
\\d=\frac{l}{f}$
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 - 7.5 Formulas, Applications, and Variation - 7.5 Exercise Set - Page 485: 13
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