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A title, labeled axes (for graphs), markings on the axes (again, for graphs) and units of measurement. You could use any of the above, based on your context
The y-Variable
The minimum requirement are data and a key (or legend). No axes are required if the graph is a pictogram.
To read a chart, start by identifying the x and y axes and the units of measurement. Then, locate the data points or markers on the chart and analyze their position relative to the axes. Look for patterns, trends, or relationships between the variables represented in the chart. Finally, interpret the information and draw conclusions based on your observations.