Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 3 Linear Systems and Matrices - 3.2 Solve Linear Systems Algebraically - 3.2 Exercises - Problem Solving - Page 165: 55

Answer

$4$ electric and $5$ acoustic guitars were sold.

Work Step by Step

Let $x$ be the number of electric guitars sold. Then the number of acoustic guitars sold is $9-x$. Thus our equation is: $479x+(9-x)339=3611\\479x+3051-339x=3611\\140x=560\\x=4$ Thus $4$ electric and $5$ acoustic guitars were sold.
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