Each point on a line graph in 2-dimensional space can correspond to an ordered pair of values for two variables which is observed. Or, if it is a fitted line graph, it is an estimated ordered pair.
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In a graph, the rise of a line usually represents an increase of some quantity. What that quantity is must be read off the graph's axes.
a line graph is over time. a bar graph is not
A cluster in a line graph is the major part of the line graph that connects to the plot.
It is a continuous line graph.
a line graph is over time. a bar graph is not