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Linear involves concepts related to straight lines or proportional relationships. In mathematics, a linear function is a function whose graph is a straight line. This means that for a constant change in the input value, there is a constant change in the output value. The general form of a linear function in two variables is often expressed as y = mx + b, where 'm' represents the slope of the line and 'b' represents the y-intercept.

The term linear can also be applied to equations. A linear equation is an equation where the highest power of the variable is one. For example, 2x + 3 = 7 is a linear equation. Systems of linear equations involve multiple linear equations that are solved simultaneously to find values that satisfy all equations at once.

In other fields, "linear" describes a process or a relationship that follows a direct and predictable path. For instance, linear progression suggests movement or development in a straight line, without significant deviations or complexities. This contrasts with non-linear processes, which can involve curves, feedback loops, or unpredictable changes. The concept of linearity is fundamental to many areas of science, engineering, and economics, providing a simplified yet powerful model for understanding various phenomena.