The equation y = 4.75x + 20 gives the cost y of towing a car if the car is towed x miles. Which statement is true?
A.For every mile the car is towed, the cost decreases by $20.
B.For every mile the car is towed, the cost decreases by $4.75.
C.For every mile the car is towed, the cost increases by $4.75.
D.For every mile the car is towed, the cost increases by $20.