Statistics.. just need the answer and not the whole explanation please

Let the total cost of hosting an event in dollars be y, for x number of people in attendance. The linear equation would be written as y = 9.75x + 780. When y = 0, what is x and what does it represent? (Don't worry if the answer makes, sense, just write what the equation is telling you. If it doesn't make sense, that is model breakdown... and that will be discussed in 10-2.) O With zero people attending, the cost of the event would be $780 With 780 people attending the cost of the event would be $0 O With zero people in attendance, the cost of the event would be -$80 O With 80 people in attendance, the cost of the event would be $0 O With -80 people in attendance, the cost of the event would be $0