Answer
$d=10-c$
Work Step by Step
Since you are buying gifts for 10 people, the total number of CDs (c) and DVDs (d) is 10.
$d+c=10$
$d+c-c=10-c$
$d=10-c$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 1 - Foundations for Algebra - Pull it All Together - Page 67: Task 3A
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