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Graphs are drawn to show experimental data obtained during a scientific investigation.

It is important to consider the following when drawing a graph:

• The x-axis should be labelled (with the independent variable) and include appropriate units.
• The y-axis should be labelled (with the dependent variable) and include appropriate units.
• A suitable scale should be used that is even and results in the graph taking up at least half of the page.
• The plots should be accurately plotted.
• The plots should be joined with the appropriate straight line or curve.

Graphs are then used to identify trends or relationships present within the experimental data.