By the y variable - whatever that may be. It may be a dependent variable or another independent variable.
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The speed is the slope of the curve in such a graph.
4/3
Area under velocity versus time graph(between two given instances of time i.e. two points on time axis) gives the displacement of the body( whose graph was plotted) between those two instances i.e. in that time interval. Area under velocity time graph can be found from definite integration if the graph is a curve. Note: Area under velocity versus time graph gives displacement not distance covered by body. Note: Area enclosed between the plotted curve and time axis is taken. For convenience time should be taken in the x-axis.
If 364.24 represents days, then it is approximately the time taken by the earth to go round the sun once.
a line of best fit emphasizes the overall trend shown by all the data taken as a whole :DDD