At a bookstore, Layla paid $13 for 1 textbook and 2 novels. The textbook cost $4 more than the total cost of all the novels.
- How much did 1 textbook cost?
- How much did 1 novel cost?
(a)
Cost of 2 novels = 1 u
Cost of 1 textbook = 1 u + 4
Total cost of 2 novels and 1 textbook
= 1 u + 1 u + 4
= 2 u + 4
2 u + 4 = 13
2 u = 13 - 4
2 u = 9
1 u = 9 ÷ 2 = 4.50
Cost of 1 textbook
= 1 u + 4
= 4.50 + 4
= $8.50
(b)
Cost of 2 novels = $4.50
Cost of 1 novel
= 4.50 ÷ 2
= $2.25
Answer(s): (a) $8.50; (b) $2.25