Algebra: A Combined Approach (4th Edition)

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

Chapter 4 - Section 4.4 - Systems of Linear Equations and Problem Solving - Exercise Set - Page 321: 39

Answer

23 pieces sold at 9.50, 67 pieces sold at 7.50

Work Step by Step

$x$ pieces at 9.50 $90-x$ pieces at 7.50 90 pieces for total of 721 $9.5*x+(90-x)*7.5=721$ $9.5x+675-7.5x=721$ $2x+675=721$ $2x = 46$ $2x/2 =46/2$ $x=23$ $90-23=67$
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