Roni recently bought a car for $17,000. Her research shows the car will depreciate by an average of $1,200 per year. If x represents the number of years Roni owns the car, which of the following equations represents the value of the car after x years? A. y = 17,000x - 1,200 B. y = 1,200x - 17,000 C. y = 17,000 - 1,200x D. y = 17,000 + 1,200x