# Classwork #2.9 Summary

- Author:
- Stephen Abreu

## Classwork #2.9 Summary

Whenever we have a situation involving

**constant rates**, we are likely to have a proportional relationship between quantities of interest.- When a bird is flying at a
**constant speed**, then there is a proportional relationship between the flying time and distance flown.

- If water is filling a tub at a
**constant rate**, then there is a proportional relationship between the amount of water in the tub and the time the tub has been filling up.

- If an aardvark is eating termites at a
**constant rate**, then there is proportional relationship between the number of termites the aardvark has eaten and the time since it started eating.

- If you aren’t sure where to start,
**look at the quotients of corresponding values**. If they are not always the same, then the relationship is definitely not a proportional relationship.

- If you can see that there is a single value that we always multiply one quantity by to get the other quantity, it is definitely a proportional relationship.