Eric purchased a transit card to commute to his job at an electronics store. The function y= -2.50x + 60 models the amount of credit, y, on Eric's card. X represents the number of times Eric rides the local train. Part A: What does the slope of the function's graph represent? What does the y-intercept of the function's graph represent? Explain your reasoning. Part B: Eric refills his transit card when he has $30 or less on it. How many times