Linear System
For a function y=f(x), if its derivitive is a constant, then we say it is a linear system.
Example
For function y=2t+1, its derivitive y'=2 y' is a constant Thus y=2t+1 is a linear system.
For a function y=f(x), if its derivitive is a constant, then we say it is a linear system.
For function y=2t+1, its derivitive y'=2 y' is a constant Thus y=2t+1 is a linear system.