Key learning points

1. The y-intercept can be found by considering the graph.
2. The y-intercept occurs when the x value is zero.
3. The gradient can be found from two points.
4. The y-intercept can be found using the gradient and one of the points.
5. It is useful to check using the second point while understanding the limitations of this check.

Common misconception

Keywords

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

• Intercept - An intercept is the coordinate where a line or curve meets a given axis.

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