From EleMaths Software:
Software for teaching and learning of linear equations with two unknowns. Solutions by the elimination and substitution methods. Worked examples of solutions with each method shown side by side for easy comparison. Explanations provided for important steps in the solution to help understanding. It can generate hundreds of sums (up to 200 per session) for practice, but users may also choose to key in their own equations. Marks automatically and can print a detailed report after each session.