In the standard (x, y) coordinate plane, a line segment
has its endpoints at (3,6) and (9,4). what are the coordinates
of the midpoint of the line segment?

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?