Because someone wanted to study how concentration changed as time passed, and doing it graphically seemed like a good idea.
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The graph between time and concentration is a curve because it represents the relationship between the two variables as one changes over time. Concentration is typically plotted on the y-axis and time on the x-axis. The resulting curve can vary depending on the rate of change of concentration over time, which can be influenced by factors such as the reaction kinetics, the initial concentrations, and the presence of reactants and products.
The slope of the graph line or curve.
The graph of velocity-time is the acceleration.
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.
By the slope of the curve.
The slope of the curve.