Mrs Oscar paid a total of $45 for 3
y files and 8 notebooks. Each file cost $3.
- Express the cost of 1 notebook in terms of y.
- If y = 3, how much did each notebook cost?
(a)
Total amount spent on 3
y files
= 3
y x 3
= $9
y Total amount spent on 8 notebooks = $(45 - 9
y)
Total amount spent on 1 notebook = $(
45 - 9y8)
(b)
Price of each notebook if
y = 3
= (45 - 9 x 3) ÷ 8
= (45 - 27) ÷ 8
= 18 ÷ 8
= $2.25
Answer(s): (a) $(
45 - 9y8) or $
45 - 9y8; (b) $2.25