I need help answering this ASAP

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

What is r i 4.5+10r=-6.5 with work pls

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?