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 10.1 Systems of Linear Equations: Substitution and Elimination - 10.1 Assess Your Understanding - Page 734: 40

Answer

$x=4; y=3$ or $(4, 3)$

Work Step by Step

We need to solve the given system of equations: $$\dfrac{4}{x}-\dfrac{3}{y}=0 \quad \quad \quad(1)\\ \dfrac{6}{x}+\dfrac{3}{2y}=2\quad \quad \quad(2)$$ First, we will multiply equation $(1)$ by $\frac{1}{2}$ to get $$\dfrac{4}{2x}-\dfrac{3}{2y}=0\quad \quad \quad(3)$$ Now, add equations $(2)$ and $(3)$ to obtain: \begin{align*} \\\left(\dfrac{6}{x}+\dfrac{3}{2y}\right)+\left(\dfrac{4}{2x}-\dfrac{3}{2y}\right)&=2+0\\ \\\dfrac{6}{x}+\dfrac{4}{2x}&=2\\ \\\dfrac{6}{x}+\dfrac{2}{x}&=2\\ \\\dfrac{8}{x}&=2\\ \\8&=2(x)\\ \\4&=x \end{align*} Finally, back substitute $x$ into Equation $(1)$ to solve for $y$: $$\dfrac{4}{4} -\dfrac{3}{y}=0 \implies 1-\dfrac{3}{y}=0 \implies 1=\dfrac{3}{y} \implies y=3$$ So the solution is $x=4; y=3$ or $(4, 3)$.
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