1. m = -3,b = 5 how can i get this answer

Answer this 30 points and brainliest!

1. a parachutist is 800 feet above the ground when she opens her parachute. she then falls at a constant rate of 5 feet per second. select the equation that represents this situation. h = -800t + 5 y = -5x + 800 h = 5t - 800 y = 800x + 5 i need

Witch represents the inverse of the function f(x)=1/4x-12