Linearity

Linearity refers to a relationship between two variables where a change in one variable causes a proportional change in the other. In mathematical terms, this relationship can be represented by a straight line on a graph. For example, if doubling one variable results in doubling the other, the relationship is linear. Linearity implies predictability and simplicity, as the effect of one variable on the other remains constant across different values. This concept is fundamental in various fields like mathematics, physics, and economics, as it helps to model and understand systems where relationships are straightforward and proportional.