Two airplanes are in flight. The function [math] f(x) = 400x + 1200[/math] represents the altitude, [math]f(x)[/math], of one airplane after [math]x[/math] minutes. The graph below represents the altitude of the second airplane.
[list=1] [*]Identify the rate of change for the first function. [*]Identify the [math]y[/math]-intercept for the first function. [*]Identify the rate of change for the second function. [*]Identify the [math]y[/math]-intercept of the second function as the coordinate of the line that intersects with the [math]y[/math]-axis. [*]Compare the properties of each function. [/list]