Question

A used book store also started selling used CDs and DVDs. In the first week, the store sold 40 used CDs and DVDs, at

$6.00 per CD and $4.00 per DVD. The sales for both CDs and DVDs totaled $180.00. Write a system of equations to
represent this situation

Answer 1

6c + 4d = 180

c + d = 40

c represents the CDs and d represents the DVDs.