Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.9 - The Coordinate Plane; Graphs of Equations; Circles - 1.9 Exercises - Page 102: 19

Answer

See the images below.

Work Step by Step

(a) In this case we have two parts. We can write the first expression as: $x>-2$ $x<2$ It means, that $x$ values vary between $-2$ and $2$. So the graph will be between lines $x=-2$ and $x=2$ Note, We have strict inequality,. Second part is simply region above $y=1$ axis. So, the final solution is intersection of both of the graphs. See the image above. (b) $xy$ is a simple product. Product can be negative if and only if only one of them is negative and another one positive number. So we need regions where either $x$ is or $y$ is negative. That is $2^{nd}$ and $4^{th}$ quadrant. See the image below
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