Admission for a water park is $17.50 per day. A season pass costs $125. A locker rental costs $3.50 per day. What is an equation that represents the relationship between the cost of a daily pass and cost of a season pass?

Daily __ 17.50d + 3.50d=C
Seasonal __ 125+3.50d=C

D= the number of days they went and C =the total cost of the trip