Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 10 - Section 10.3 - Solving Nonlinear Systems of Equations - Exercise Set - Page 624: 14

Answer

$(-\frac{1}{6},-6),(1,1)$

Work Step by Step

$6x-y=5$ Equation $(1)$ $xy=1$ Equation $(2)$ From Equation$(2)$ $y=\frac{1}{x}$ Equation$(3)$ Substitute $y=\frac{1}{x}$ in Equation$(1)$ $6x-y=5$ $6x-\frac{1}{x}=5$ $\frac{6x^{2}-1}{x}=5$ $6x^{2}-1 = 5x$ $6x^{2}- 5x-1 = 0$ By factoring, $(6x+1)(x-1)=0$ $x = -\frac{1}{6}$ or $x=1$ Substitute $ x$ values in Equation $(3)$ Let $x = -\frac{1}{6}$ $y=\frac{1}{x}$ $y=\frac{1}{-\frac{1}{6}}$ $y = -6$ Let $x=1$ $y=\frac{1}{x}$ $y=\frac{1}{1}$ $y=1$ Solutions $(-\frac{1}{6},-6),(1,1)$ both satisfy both the equations. So, the solutions are $(-\frac{1}{6},-6),(1,1)$
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