How do i put something into slope intercept form

Arestaurant charges $100 to rent its banquet room for an event. it also charges $15 to serve dinner to each guest. write an equation for the total cost of the banquet room in terms of the number of guests. deine your variables. what is the total cost of the banquet room for 20 guests?

Can someone show me step by step how to do this?

Urgent? will give brainliest to the first correct answer what is the area of the figure?