8x+4y=-56 can some one show me step by step

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?

Simplify the algebraic expression 8y-2(y+4)

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.