Key learning points

1. An equation is a statement that two expressions are equal, indicated by =.
2. Linear expressions can be represented by a straight line on a graph.
3. Non-linear expressions can be identified from their graphical form.
4. Equations can be grouped as linear or non-linear.

Keywords

• Gradient - The gradient is a measure of how steep a line is

• Expression - Expressions contain one or more terms, where each term is separated by an operator.

• Equation - An equation is used to show that one number or calculation is equal to another.

• Linear - The relationship between two variables is linear if, when plotted on a pair of axes, a straight line is formed.

Common misconception