Key learning points

1. Where a problem gives multiple ways of connecting two things, it may mean simultaneous equations can be written.
2. If simultaneous equations can be written, it is important to state what each variable stands for.
3. The solutions should always be given in context.

Common misconception

Keywords

• Substitution - Substitute means to put in place of another. In algebra, substitution can be used to replace variables with values, terms, or expressions.

• Elimination - Elimination is a technique to help solve equations simultaneously and is where one of the variables in a problem is removed.