Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 8 - Systems of Linear Equations and Problem Solving - 8.1 Systems of Equations in Two Variables - 8.1 Exercise Set - Page 508: 51


23 classics watches and 12 plus watches.

Work Step by Step

We first write the word problem as an equation. Next, we solve the equation using substitution. Doing this, we find: $$ x+y=35, 39.99x+59.99y=1639.65 \\ \frac{3999}{100}\left(35-y\right)+\frac{5999}{100}y=\frac{8198}{5} \\ y=12 \\ x=35-12=23 $$
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