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• The independent variable is shown on the \(\text{x}\)-axis and the dependent variable is the \(\text{y}\)-axis.
• Variable A might be the weight added to a spring (N) and variable B might be the length of the spring (cm).
• The graph must have linear \(\text{x}\) and \(\text{y}\) axes – each square must go up by a regular amount each time.
• Each axis must be fully labelled with the correct unit.
• The graph drawn should be scaled so that it occupies at least half of the graph paper in both directions.
• The intervals on the \({\text{x}}\) and \(\text{y}\) axes should not go up in 3 s, 6 s, 7 s, or 9 s, use 1 s, 2 s, or 5 s and multiples of these, for example 10 s, 20 s, 40 s, 50 s are good as they are easy to plot and read.
• Connect the plotted points with a ruler to draw a best line or curve of fit. No dot to dot joining.

The gradient is the \(\frac{\text{change in vertical amount}}{\text{change in horizontal amount}}\).