Key learning points

1. A trial and improvement approach can be used if a model can't easily be drawn.
2. A table can be used to record and check all possible solutions have been found.
3. Some problems with two unknowns have an infinite number of solutions.

Keywords

• Systematically - To work systematically means to work in an organised way, often according to a fixed plan or system.

• Infinite - Infinite means without an end. If something is unlimited, you could say it has an infinite number of things.

Common misconception