Kaitlyn is mowing her lawn. The lawn has an area of 5,625 square feet. She can mow about 75 square feet each minute. Which equation represents the amount of lawn, y, that Kaitlyn still has left to mow after x minutes?
A) y = 5,625 – 75x
B) y = 5,625 (x – 75)
C) y = 5,625 + 75x
D) y = 5,625 (75 – x)