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: 39

Answer

See below:

Work Step by Step

Consider the provided condition, The y-variable is at least 4 more than the product of $-2$ and the x-variable. $y\ge -2x+4$ Now, replace the inequality sign with an equal sign. $y=-2x+4$ Now, substitute $y=0$ for x-intercept. $\begin{align} & \left( 0 \right)=-2x+4 \\ & x=\frac{4}{2} \\ & =2 \end{align}$ The above substitution gives the coordinate as $\left( 2,0 \right)$. Now, calculate the y intercept by substitute x as 0. $\begin{align} & y=-2\left( 0 \right)+4 \\ & =4 \end{align}$ The above substitution gives the coordinate as $\left( 0,4 \right)$. Thus, the inequality equation in two variables is $y\ge -2x+4$ and it can be graphed as shown below:
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