Answer
$r=\frac{E-IR}{I}$
Work Step by Step
$I=\frac{E}{R+r}\\I(R+r)=E\\IR+Ir=E\\Ir=E-IR\\r=\frac{E-IR}{I}$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 6 - Section 6.7 - Formulas and Applications of Rational Equations - Exercise Set - Page 475: 12
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