Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 10 - Section 10.8 - Systems of Nonlinear Equations - 10.8 Exercises - Page 755: 41

Answer

$(\sqrt 10, 10)$

Work Step by Step

Given the system of equations: 1. $\log x + \log y = 3/2$ 2. $2\log x - \log y = 0$ The question asks to find all real solutions. Add equations 1 and 2 $\log x + \log y = 3/2$ + ($2\log x - \log y = 0$) $3\log x = 3/2$ $\log x = 1/2$ $x = 10^{1/2} = \sqrt 10$ Substitute the values into the equation $\log (10^{1/2}) + \log y = 3/2$ $1/2 + \log y = 3/2$ $\log y = 1$ $y = 10$ All Solutions: $(\sqrt 10, 10)$
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