Ashley harrison takes out a $100,000 mortgage. the total amount of interest for 30 years is $90,000. what is the payment per month? monthly payment = $

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?