Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 10 - Systems of Equations and Inequalities - Section 10.6 Systems of Nonlinear Equations - 10.6 Assess Your Understanding - Page 795: 75

Answer

$(\frac{1}{2},\frac{1}{3})$

Work Step by Step

1. Let the two numbers be $x, y$, based on the given conditions, we can set up the following: $\begin{cases} xy=x-y \\ \frac{1}{x}+\frac{1}{y}=5 \end{cases}$ 2. Divide the 1st equation by $xy$ to get $\frac{1}{y}-\frac{1}{x}=1$, 3. Add the result to the 2nd equation to get $\frac{2}{y}=6$, thus $y=\frac{1}{3}$, 4. Use the 2nd equation again to get $\frac{1}{x}+3=5$, thus $x=\frac{1}{2}$ 5. Thus, we get the solution(s) as: $(\frac{1}{2},\frac{1}{3})$
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