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 - Chapter Review - Review Exercises - Page 814: 4

Answer

$(x,y)=(\dfrac{11}{5},\dfrac{-3}{5})$

Work Step by Step

$ y=2x-5 ~~~ (1)$ $x=3y+4 ~~~(2)$ Substitute $y=2x-5$ into Equation-2 to evaluate the value of $x$. $x=3(2x-5)+4 \\ 5x=11 \implies x=\dfrac{11}{5}$ Plug $x=\dfrac{11}{5}$ back into one of the equations and solve for y. Thus, $y=(2)(\dfrac{11}{5})-5 \\ y=\dfrac{-3}{5}$ Therefore, $(x,y)=(\dfrac{11}{5},\dfrac{-3}{5})$
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