I can draw graphs of the form y = a; x = a and interpret linear graphs in context.
I can draw graphs of the form y = a; x = a and interpret linear graphs in context.
Linear - The relationship between two variables is linear if, when plotted on a pair of axes, a straight line is formed.
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.
Pupils draw x = a as a horizontal line because the x axis is horizontal. Pupils draw y = a as a vertical line because the y axis is vertical.
Consider the points on the line x = 5 and ask pupils to plot 2-3 points. Can they see why it must be a vertical line?
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A (pink) -Â $$y = -2.5$$
B (blue) -Â $$y = 2.5$$
C (purple) -Â $$x = -2.5$$
D (black) -Â $$x = 2.5$$
