Solution of a linear system (source code)

= Solution of a linear system
{title2=$x$}

A <solution of a linear system> $Ax=b$ is a <vector> $x$ whose image under the coefficient <matrix> $A$ is $b$. Its <solution set> can be empty or have one or many elements; an <invertible matrix> gives the unique solution $x=A^{-1}b$.