Gene has a gasoline budget of $275 per month. He uses an average of $6 of gasoline each day he drives. Which of the following equations represents how much money is left in his gasoline budget after x days of driving?
A.
y = 275 - 6x
B.
y = 275 + 6x
C.
y = 6x - 275
D.
y = 275x - 6