Problema Solution
At a garage sale, a CD costs three times as much as a book. You spend $28 to buy two books and four CDs. Choose a system of equations to find the price of a CD and the price of a book. Then solve.
Answer provided by our tutors
Let
b = the price of a book, p>=0
c = the price of a CD, c>=0
A CD costs three times as much as a book:
c = 3b
You spend $28 to buy two books and four CDs:
2b + 4c = 28
We have the following system of equations:
c = 3b
2b + 4c = 28
........
........
b = $2
c = $6
The price of a CD is $6.
The price of a book is $2.