Which of the following does not have only one solution. a. x+3 = 7
b. 7x = 4x + 2
c. (x+3)(x - 2) = 0
d. -3= 2x – 5

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?