Aretha wanted to gather data about the cost of local bowling leagues in her area. She plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20.Identify and interpret the y-intercept in this model. The y-intercept is 20. This is the cost per month. The y-intercept is 20. This is the cost of registration. The y-intercept is 15. This is the cost of registration. The y-intercept is 15. This is the cost per month.