# Linearity

### Glossary Term

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The term "linear" is generally used for a proportional relation between two parameters.
The term of a linearity is based on a general linear function between the real size values of two physical values. They are used to describe a structural component or a physical relation of an initial value {\displaystyle x} and a result value {\displaystyle y}, and if these values are sufficient for the equation, it is referred to as a linear component or a linear relation.

If such a relation is displayed in a rectangular coordinate system with uniform distances on both axes, the relation is displayed as a straight line.

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