500
A car is traveling down a long steep hill. At 0 seconds the car is 7500 feet above above sea level. At 8 seconds the car is 5500 feet above sea level. At 15 seconds the car is at 3750 feet above sea level. Define your variables, and write an equation that represents the height above sea level (in feet) that the car is at.
x = seconds
y = height of car
y = 7500 - 250x