College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 8 - Section 8.7 - Systems of Inequalities - 8.7 Assess Your Understanding - Page 624: 56

Answer

$x\geq0$ $x\leq5$ $y\leq6$ $y\geq 0.75x+3$ $y\geq2x-8$

Work Step by Step

There are two vertical lines: x=0 and x=5. The area is to the right of x=0, so $x\geq0$. It is to the left of x=5, so $x\leq5$. There is one horizontal line: y=6 The area is under it, so $y\leq6$. There are two linear functions. One has a slope of $m=\frac{0-3}{4-0}=\frac{3}{4}=0.75$ and a y-intercept of (0,3). The area is over that line, so $y\geq 0.75x+3$. The other linear function has a slope of $m=\frac{2-0}{5-4}=\frac{2}{1}=2$. To find the y-intercept, we use one of the points and solve for b: $0=4(2)+b$ $b=-8$ The area is over that line, so $y\geq2x-8$
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