45 represents the slope while -900 is the y-intercept of the function
Here, we want to write the slope and y-intercept of the function that represents Patrick's elevation during his climbing
From the question, we are told that he averaged an elevation of 45 meters per hour
What the slope basically does is to measure a rate of change. As we can see from here, the change represents a rate and thus, we have this as our slope
To get the y-intercept of the function, we can see this as a distance of -900 meters
The reason for this is that we can see the summit of the mountain as 0 m
So we can represent the equation as;