Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 13 - Review - Page 963: 48

Answer

Please see the graph.

Work Step by Step

Orange line: $x^{2}+y^{2}\le16$ Red line: $x^{2}+y^{2}\geq4$ To determine what sides of the lines to shade, we pick the point $(0,0)$ and determine if the inequalities are valid. We will use a solid orange line and a solid red line since the two inequalities respectively have a less than or equal to sign and a greater than or equal to sign. $(0,0)$ $x^{2}+y^{2}\le16$ $0^{2}+0^{2}\le16$ $0 +0 \le 16$ $0 \le 16$ (true, so we shade inside the circle) $(0,0)$ $x^{2}+y^{2}\geq4$ $0^{2}+0^{2}\geq4$ $0 + 0 \geq 4$ $0 \geq 4$ (false, so we shade outside the circle) The overlap of the two graphs is the solution set for the set of inequalities.
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