Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 9 - 9.2 - Two-Variable Linear Systems - 9.2 Exercises - Page 646: 18

Answer

$(\frac{5}{6},\frac{5}{6})$

Work Step by Step

Multiplying equation 1 by -8, we get: $-16r-32s=-40$ and $16r+50s=55$ Adding both equations, we get $18s=15$ and thus $s=\frac{5}{6}$ (Elimination) Substituting the value of s in equation 2: $16r + 50\times \frac{5}{6}=55$ This becomes $16r=55-\frac{250}{6}=\frac{80}{6}$ and $r=\frac{80}{96}=\frac{5}{6}$ Thus, we get $(\frac{5}{6},\frac{5}{6})$ as a solution.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.