A system of linear equations is two or more simultaneous linear equations. In mathematics, a system of linear equations (or linear system) is a collection of linear equations involving the same set of variables.

It is a system of linear equations which does not have a solution.

Linear system follows principal of superposition and homogeneity and Non linear system does not follow the same.

The linear momentum of a system of particles is simply the vector sum of the linear momentum of each of the particles.

Linear system has a proportional slope, which gives the system a straight line. And, a non-linear system has a non-proportional slope, which is represented by a non-straight line (usually a curved one). Feel free to edit if you think this is not to the point.