Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 7 - Algebra: Graphs, Functions, and Linear Systems - Chapter Summary, Review, and Test - Review Exercises - Page 481: 38

Answer

\[\left\{ \left( 4,-2 \right) \right\}\]

Work Step by Step

Substitute the value of \[x=3y+10\]in the first equation and solve \[\begin{align} & 2x+3y=2 \\ & 2\left( 3y+10 \right)+3y=2 \\ & 6y+20+3y=2 \\ & 9y+20=2 \end{align}\] Solve further as \[\begin{align} & 9y=2-20 \\ & y=-\frac{18}{9} \\ & y=-2 \end{align}\] Substitute the value of \[y=-2\]in the second equation as follows: \[\begin{align} & x=3\left( -2 \right)+10 \\ & =-6+10 \\ & =4 \end{align}\] Hence, the value of x is 4 and y is −2.
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