An airplane's altitude in feet during its descent can be found using the equation y=-200x + 20,000. After new government
regulations become law the descent is now modeled by the
equation y= -200x + 20,500. Which statement describes this
change?
a) The airplane starts its descent from an altitude 500 feet
higher
b) The airplane starts its descent from an altitude 500 feet
lower
c) The airplane descends 500 feet per horizontal mile faster.
d) The airplane descends 500 feet per horizontal mile slower.