The temperature in Vancouver was recorded over four hours with the equation y = -2x + 43. Which statement correctly describes the temperature?
a) It was -2°F when first measured, rising by 43°F per hour.
b) It was 43°F after four hours, dropping by 2°F per hour.
c) It was -2°F after four hours, rising by 43°F per hour.
d) It was 43°F when first measured, dropping by 2°F per hour.