dr fisher is researching the growth culture of bacteria. he records the count of bacteria, y, after x hours. he wants to determine whether there is a relationship between the amount of time passed and the count of bacteria. he finds that the linear model that best fits the data is y= -143+51x

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?