Some recorded data may need a necessary change while continuous observations are still being recorded.
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a line graph is called a line graph because first of all it uses lines and second of all its on a graph they use those lines to connect the dots so if you dont what im talking about with dots thats a whole diffrent question so look it up yourself
When you have two points of a line, you can connect the dots.
By looking at the dots reaching the positive end of the graph and referring to the legend(if applicable)
I think that the difference is that a scatter plot graph has dots on it and that a line graph doesn't. Am sorry if I didn't answer your question properly but this is what I can offer. If it was not enough am sorry.
No - a line graph may peak and trough depending on the data marked on the graph - a bit 'like join the dots'.