Ineed with this! angle relationships

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

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?

Which is the graph of the linear equation x – 2y = 6?