Sylvia finds the solution to the system of equations by graphing y=2/3x + 1 and y = -2/3x-1 which graph shows the solution to sylvia’s system of equations

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?