Question

If 1 pound of grapes cost 3.25 and2 pounds cost 6.50 what do 3,4,5,6,7,8,9 pounds cost?

Answer 1

3, would be 9.75
4, would be 13
5, would be 16.25
6, would be 19.50
7, would be 22.75
8, would be 26
9, would be 29.25
OR 3.25x = y (y being 3-9)