Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 4 - Section 4.4 - Linear Inequalities in Two Variables - Exercise Set - Page 294: 12

Answer

The graph is shown below.

Work Step by Step

The inequality is $y\gt\frac{1}{4}x$ Step 1:- Replace the inequality symbol with $=$ and graph the linear equation. $y=\frac{1}{4}x$ Now use the slope and the $y-$ intercept to graph. The equation in the form of $y=mx+b$ is $\Rightarrow y=\frac{1}{4}x+0$ Where, slope $m=\frac{1}{4}=\frac{Rise}{Run}$ and $y-$ intercept $=0$. Therefore the first point is $A=(0,0)$ For the second point we move one unit up (rise) and four units right side (run). The second point is $B=(4,1)$ There is no equality sign therefore we draw a dashed line through both points. Step 2:- Choose a test point and plug into the inequality. Let the test point $C=(1,1)$. Plug the test point into inequality. $\Rightarrow (1)\gt\frac{1}{4}(1)$ Simplify. $\Rightarrow 1\gt\frac{1}{4}$ The statement is correct. The solution set contains the test point. Hence, the upper part of the line is the solution set.
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