The cost, C , can be determined by multiplying the number of toppings (t ) ordered by $2.15 and adding on the basic price, b.
C = 2.15 • t + b
You can use the information provided about the 3-topping pizza to find the basic cost first.
$13.25 = 2.15 • 3 + b
13.25 = 6.45 + b
13.25 - 6.45 = 6.45 + b - 6.45
$6.80 = b
The basic price for any pizza ordered is $6.80
Now we can write the following equation that could be used to find the cost of any pizza ordered:
C = $2.15 • t + $6.80
Hope this helps Gian. Let me know if you have more questions or would like to schedule a learning session.