# Example 3

- Author:
- Walch Education

- Topic:
- Functions

Two airplanes are in flight. The function represents the altitude, , of one airplane after minutes.
The graph below represents the altitude of the second airplane.

- Identify the rate of change for the first function.
- Identify the
-intercept for the first function. - Identify the rate of change for the second function.
- Identify the
-intercept of the second function as the coordinate of the line that intersects with the -axis. - Compare the properties of each function.