Your hiking on a trail that leads to the top of a mountain. 1 PM you reach 4400 feet. 4 PM you reach 5600 feet. What is your mean hourly change in elevation?

Question

I got the answer from this website but I don´t understand how the person got it, can someone explain??

Answer 1

It's the slope (m) of the line connecting the endpoints (1,4400) and (4,5600). Use the slope formula:

m = (y₂-y₁)/(x₂-x₁) = (5600-4400)(4-1) = _____ feet per hour