The line graphs are useful for making some average result or a prediction. This type of graph is used when there is a group of data is available. In this graph, there are two axes - x-axis and Y-axis. The variables we plot in the line graph are independent. There is no dependent variable in the line graph, for which we use it for prediction. It is not used for the exact results.
For example the growth of bacteria with time in the culture medium. The number of bacteria will grow with time. This growth has an optimum limit. Here the time and the number of bacteria are independent variables. They change from one point to another and we get an estimation. Similarly, the aging of individuals with time is plotted on the line graph. Line graphs help to predict a group of data. By line graph, We can also infer data, we did not collect.
