Linked from
The 29 pages that link to Linear system, each with the reason it gives.
Least squaresNarrower topic: Least squares handles linear systems that have no exact solution.
InterferenceRelated: Linear behavior makes wave superposition and predictable interference possible.
Nonlinear systemCompared with: It obeys superposition, unlike a genuinely nonlinear system.
Affine subspaceRelated: A consistent linear system has an affine subspace as its full solution set.
Skew linesRelated: Solving parametric line equations reveals whether two lines meet.
Successive over-relaxationNarrower topic: SOR approximates solutions to systems of this form.