The size of a writing your computer monitor is determined by the length of its diagonal if a computer monitor has a link at 24 inches in height of 18 inches what is the length of its diagonal to the nearest inch

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?