Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 7 - Section 7.1 - Systems of Linear Equations in Two Variables - Exercise Set - Page 821: 81


a. $y=0.8+0.45x$ b. $y=2.6+0.15x$ c. $6$ weeks, $3.5$ symptoms for each group; intersection point $(6,3.5)$.

Work Step by Step

a. Based on the given conditions, we can write the function as $y=0.8+0.45x$ b. Similarly, based on the given conditions, we can write this function as $y=2.6+0.15x$ c. Let $0.8+0.45x=2.6+0.15x$; we have $0.3x=1.8$ and $x=6$ weeks. At $x=6$, we have $y=0.8+0.45(6)=3.5$ symptoms for each group. These results are shown in the corresponding figure as the intersection point $(6,3.5)$.
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