A phone company offers two long-distance plans. The first charges a flat value of $5.00 per month plus $0.99 for each minute used, and the second charges $10.00 a month plus $0.79 for each minute used. If x represents the number of minutes used each month, which system of equations represents the total amount of money, y, you would spend for each long-distance plan? a.) y = 5x + 0.99 y = 10x + 0.79 b.) x = 0.99y +5 x = 0.79y + 10 c.) x = 5y + 0.99 x = 10y + 0.79 d.) y = 0.99x + 5 y = 0.79x + 10