i need in a linear equation please i need help

Caterer One charges $55 per person. The cost of renting the hall is included.
● Caterer Two charges $550 for hall rental plus $40 per person.
● Cater Three charges $800 for hall rental plus $35 per person.
Write the equation to represent the cost of each caterer.
Use C to represent cost ($), and n to represent the number of people.