Key learning points

1. Graphs can be described by looking at how quickly they fall.
2. The amount y decreases when x increases by one is the rate of change and is called the gradient.
3. The gradient will be negative if y decreases as the graph moves to the right.
4. The gradient can be found from any linear graph.
5. The gradient tells us important information about the relationship.

Keywords

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

• Absolute value - The absolute value of a number is its distance from zero.

• Parallel - Two lines are parallel if they are straight lines that are always the same (non-zero) distance apart.

Common misconception