Example LF.DLInEQ.0 Dynamic Views for solving an inequality $f(x)=mx+b\le c$ on Mapping Diagrams.

On the GeoGebra sketch you can change the values of $m=A$ and
$b=B$
(with the sliders) and $C$ (currently $2$ on the target axis) to see
linear inequalities $Ax + B \le C$ solved visually with the mapping
diagram.