Answer:
4r + 2s = 18
Step-by-step explanation:
since raspberries are $4 a carton and strawberries are $2 a carton.
we can use variable to represent both strawberries and raspberries
strawberries = s
raspberries = r
since the total of both the items are $18 . we can create this formula:
this means 4 multiplied by the number of cartons of raspberries + 2 * the number of cartons of strawberries = $18