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 454: 44

Answer

See below:

Work Step by Step

consider the provided inequalities, \[x-y\ge -1\]and\[5x-2y\le 10\] Replace each inequality symbol with an equal sign, \[x-y=-1\]and\[5x-2y=10\] Now, draw the graph of the equation\[x-y=-1\]: Put \[y=0\] for x-intercept and \[x=0\] for y-intercept in the equation \[x-y=-1\]. So, the x-intercept is \[-1\] and y-intercept is \[1\]. Therefore, the line is passing through \[\left( -1,0 \right)\]and \[\left( 0,1 \right)\]. Now, consider a test point \[\left( 0,0 \right)\], which lies in the half-plane above the line. Substitute \[x=0\] and \[y=0\]in \[x-y\ge -1\]. \[\begin{align} & 0-0\ge -1 \\ & 0\ge -1 \end{align}\] Since \[\left( 0,0 \right)\]satisfies the above inequality \[x-y\ge -1\]. So, the test point \[\left( 0,0 \right)\] is part of the solution set. All the points on the same side of the line \[x-y=-1\]as the point \[\left( 0,0 \right)\] are members of the solution set. Since,\[x-y\ge -1\] contains an equal sign. So, the line should be solid. Now, draw the graph of the equation\[5x-2y=10\]: Put \[y=0\] for x-intercept and \[x=0\] for y-intercept in the equation \[5x-2y=10\]. So, the x-intercept is \[2\] and y-intercept is \[-5\]. Therefore, the line is passing through \[\left( 2,0 \right)\]and \[\left( 0,-5 \right)\]. Now, consider a test point \[\left( 0,0 \right)\], which lies in the half-plane above the line. Substitute \[x=0\] and \[y=0\]in \[5x-2y\le 10\]. \[\begin{align} & 5\cdot 0-2\cdot 0\le 10 \\ & 0\le 10 \end{align}\] Since \[\left( 0,0 \right)\]satisfies the above inequality \[5x-2y\le 10\]. So, the test point \[\left( 0,0 \right)\] is part of the solution set. All the points on the same side of the line \[5x-2y=10\]as the point \[\left( 0,0 \right)\] are members of the solution set. Since,\[5x-2y\le 10\] contains an equal sign. So, the line should be solid. Therefore, the graph of the provided linear inequality is:
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