Hi ik no one would have any hope in my friend basically he got super sick .. and he said nothing would make him feel happier if yall don't help him with his subs .. his Yt is 999 splxsh if you do this i would give brainliest and appreciate you a lot :)

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?