c = 9 + 3n (option A)
Explanation:
when n = 0, c = $9
This means $9 is the initial price
We need to find the cost pre toppings. To do that, we calculate the change in cost divided by the change in topping.
rate of Change = (12-9)/(1-0) = (15-12)/(2-1)
rate of change = 3/1 = 3
If the number of toppings = n
The cost = initial cost + (rate of change × number of toppings)
The cost = $9 + (3× n)
The equation best represents the relationship between the cost and the number of toppings: c = 9 + 3n (option A)
