College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 5 - Systems of Equations and Inequalities - Exercise Set 5.5 - Page 572: 68

Answer

$ x^{2}+y^{2} \leq 25$ $x+2y \geq 5 $ .

Work Step by Step

First sentence: $\quad x^{2}+y^{2} \leq 25 $ Second sentence: $\quad x+2y \geq 5 $ 1st inequality ($ \leq $ inequality sign, border solid):: $x^{2}+y^{2} = 25$ is a circle, centered at (0,0), radius 5. Test point: (0,0). $\quad $Is $ 0^{2}+0^{2} \leq 25 \quad ?$ Yes. shade the region containing (0,0). 2nd inequality ($ \geq$ inequality sign, border solid): Graph $x+2y = 5:$ $2y=-x+5$ $y=-\displaystyle \frac{1}{2}x+\frac{5}{2}$ y intercept=$\displaystyle \frac{5}{2}$, and for x=5, y=$0$ . Draw the line through (0,$\displaystyle \frac{5}{2}$) and ($5,0$) Test point: (0,0). $\quad $Is $0+2(0) \geq 5 ?$ No. shade the region not containing (0,0). The solution set is the region with both shadings. (grey on the screenshot)
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.