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 - Chapter Summary, Review, and Test - Review Exercises - Page 482: 51

Answer

See below:

Work Step by Step

Step 1: Convert the inequality to an equation by replacing > by = sign. \[2x-7y=14\] Step 2: Graph the equation using intercept form or slope-intercept form. Make \[x=0\] to find the y-intercept, \[\begin{align} & 2x-7y=14 \\ & 0-7y=14 \\ & y=-2 \end{align}\] Make \[y=0\] to find x-intercept, \[\begin{align} & 2x-7y=14 \\ & 2x-0=14 \\ & x=7 \end{align}\] The line passes through \[\left( -2,0 \right)\]and \[\left( 0,7 \right)\]. The line is dashed since the inequality contains the > symbol. Step 3: Choose a test point. The origin \[\left( 0,0 \right)\]be the test point. Substituting in the inequality \[\begin{align} & 2x-7y>14 \\ & 0>14 \end{align}\] The statement is false. The graph does not contain the test point.
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