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: 1

Answer

$(2,-1)$

Work Step by Step

We write the given equations and multiply the first equation by $2$: $ 4x-2y= 10 ~~~ (1)$ $5x+2y=8 ~~~(2)$ Now add the two equations to evaluate the value of $x$. $9x=18 \implies x=2$ Plug $x=2$ back into one of the equations and solve for y. Thus, $(2)(2)-y=5 \implies y= -1$ Therefore, $(x,y)=(2,-1)$
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