a graph key is when one end of the graph goes into a nother graph and makes baby graphs.
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a key on a graph is used to show you what each symbol means
it is a line on a graph that is curved
A key can make it easier to interpret the data sets that each part of the graph represents, especially if there is no room in the graph area for labels.
it means that you are plotting the points on a graph, or XY coordinate plane
what does key mean in math