This calculator allows you to plot multiple equations on a single graph, which can help in linear programming. All the equations are color-coded, so it is easy to distinguish them from one another.

Form, manipulate and solve linear inequalities with number lines and graphs. Spot inequalities in real life like taxi fares, cake sales and buying games.

Learn about and revise how to show inequalities on number lines and graphs, as well as solve inequalities with this BBC Bitesize GCSE Maths Edexcel guide.

Stephen M. Robinson, Stability Theory for Systems of Inequalities. Part I: Linear Systems, SIAM Journal on Numerical Analysis, Vol. 12, No. 5 (Oct., 1975), pp. 754-769 ...