Key learning points

1. Two coordinate pairs can be plotted and joined with a line.
2. The gradient of this line can be calculated.
3. The gradient between two points can be calculated without drawing the line.
4. The gradient between two points can be calculated without drawing the points.
5. The gradient between any two points on a straight line is the gradient of the line.

Common misconception

Keywords

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

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