Answer:
A
Step-by-step explanation:
Each guest pays 15 dollars and the fee is 200, so 15x+200 because adding to the cost.
Y= -35
Y = -1
I put the work in the picture below!
(Hint: just substitute the x for its number and do simple adding and subtracting)

Substitute x = 3 in any given equations. I will do in y = - x + 1

Therefore the answer is (3,-2)