Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 7 - Algebra: Graphs, Functions, and Linear Systems - 7.4 Linear Inequalities in Two Variables - Exercise Set 7.4 - Page 455: 63

Answer

\[\left\{ \begin{align} & y>x-3 \\ & y\le x \\ \end{align} \right.\]

Work Step by Step

\[y=x-3\]It intersects x-axis at \[\left( 3,0 \right)\] and y-axis at \[\left( 0,-3 \right)\] The slope of the line is, \[\begin{align} & m=\frac{{{y}_{2}}-{{y}_{1}}}{{{x}_{2}}-{{x}_{1}}} \\ & =\frac{-3-0}{0-3} \\ & =1 \end{align}\] So, the equation of the line is \[y=x-3\] The line is dashed line, the line is not included. Using the test point\[\left( 0,0 \right)\], the statement is true. The equation is \[y>x-3\] \[y\le x\]It passes through origin, y-intercept is 0. Origin cannot be the test point. From the graph, take two ordered pairs, \[\left( 1,1 \right)\] and \[\left( 2,2 \right)\] \[\begin{align} & m=\frac{{{y}_{2}}-{{y}_{1}}}{{{x}_{2}}-{{x}_{1}}} \\ & =\frac{2-1}{2-1} \\ & =1 \end{align}\] The line is a solid line. The equation is \[y\le x\] The system of linear inequalities for the graph is, \[\left\{ \begin{align} & y>x-3 \\ & y\le x \\ \end{align} \right.\]
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