A weightlifter is using a weightlifting bar that weighs 45 pounds. If x represents the amount of weight that the weightlifter puts on the bar and y represents the total amount that the weightlifter lifts, with the weight of the bar included, which of these functions models this situation
A.
y = x – 45, because the rate of change of the function should be –45 and the initial value should be 1

B.
y = x – 45, because the rate of change of the function should be 1 and the initial value should be –45

C.
y = x + 45, because the rate of change of the function should be 1 and the initial value should be 45

D.
y = x + 45, because the rate of change of the function should be 45 and the initial value should be 1