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: 46

Answer

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Work Step by Step

Put the value of B\[\left( 76,220 \right)\] in \[5.3x-y\ge 180\] and\[4.1x-y\le 140\] check for the inequality condition is satisfied. Put B\[\left( 76,220 \right)\] in \[5.3x-y\ge 180\] \[\begin{align} & 5.3\times 76-220\ge 180 \\ & 402.8-220\ge 180 \\ & 182.8\ge 180 \end{align}\] Solution exist because inequality condition is satisfied Put B\[\left( 76,220 \right)\] in \[4.1x-y\le 140\] \[\begin{align} & 4.1\times 76-220\le 140 \\ & 311.6-220\le 140 \\ & 91.6\le 140 \end{align}\] Solution exists because inequality condition is satisfied. Hence, B\[\left( 76,220 \right)\] satisfy both the inequalities that describe healthy weight for this age group and solution also exist.
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