Tables and graph represent relations by showing the distribution of occurrence.
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Intercept for a graph are points at which the graph crosses either axis. There is no such thing as an intercept for tables.
The "key" tells you what the line(s) of plotted data on a graph represent (e.g people, money, time etc...) without this information the graph is meaningless because it is incomprehensible.
A graph about masses and volumes would represent density.
a bar graph
We would have to see the graph.