Which of the following has a constant of proportionality of 1/3? (I accidentally selected the third one so don't mind that)

Which system of linear inequalities is represented by the graph? !

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)

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?