Write (14+x)+(12x-8) in standard form

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14

Sum of the interior angles of a pentagon

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?