Key learning points

1. Real life relationships can be represented using a linear graph.
2. Real life problems can be solved using a linear graph.
3. Switching between algebraic and graphical representations can help solve real life problems.

Keywords

• Rate of change - The rate of change is how one variable changes with respect to another. If constant, there is a linear relationship.

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

Common misconception