Key learning points

1. The features of the equations may mean one method is more preferable for solving.
2. You can use any of the methods that are valid.
3. You can use the other methods to check your solution.
4. The solution should be interpreted in context if context was stated.

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.

Common misconception