Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 4 - Section 4.2 - Solving Systems of Linear Equations by Substitution - Exercise Set - Page 302: 58

Answer

a) $(1,5)$ b) In 1996, about 5% of households used wall or floor furnaces. Also, 5% of households used fireplaces or wood stoves. c) Please see the graph. The percentage of households using fireplaces or wood stoves decreased faster than the percentage of households using wall or floor furnaces.

Work Step by Step

a) $y=-.04x+5.1$ $y=-.31x+5.3$ $-.04x+5.1=-.31x+5.3$ $.27x = .2$ $.27x/.27 = .2/.27$ $x= .74$ $y=-.04x+5.1$ $y=-.04*.74+5.1$ $y=-.0296+5.1$ $y=5.0704$ $y=5.07$ c) Red line: $y=-.04x+5.1$ Blue line: $y=-.31x+5.3$
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