What is two quantities related and dependent in such a way that as one increases or decreases the other varies the same way.?

Two quantities that are related and dependent in such a way that they vary together are said to have a direct relationship. In this relationship, as one quantity increases, the other also increases, and similarly, as one decreases, the other decreases. An example of this is the relationship between distance and time at a constant speed; if you travel faster (increase speed), you cover more distance in the same amount of time.