Help ASAP please estimate the solution of the linear system graphically and check the solution algebraically

x+y=-4
y=3x+16

A:(-5,1)

B:(10,-14)

C:(3,-7)

D:(4,-4)

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?