 Hello and welcome to the session. In this session we are going to study line graphs. Line graphs are used to compare two variables. Each of the variables is plotted on an axis of the graph. It has a vertical axis and a horizontal axis. Now we define various parts of a line graph. In a line graph, first is title. The title of the line graph will tell us about the graph. The title is written on the top of the graph. Second is label, horizontal label along x-axis. Vertical label along y-axis won't tell us the kind of facts. Third is scale. The horizontal scale is on x-axis. The vertical scale is on y-axis. Both will show number or how many. Points will show the facts on the graph. Fifth is lines. Connecting lines is for estimation of values on terms of the graph. Now let us learn about making a line graph. So we take an example. The table below shows the amount of rainfall in our city for six days. Day one has 30 millimeters rainfall. Day two has 20 millimeters rainfall. Day three has 35 millimeters rainfall. Day four has 0 millimeters rainfall. Day five has 10 millimeters rainfall. Day six has 15 millimeters rainfall. To show this data on the graph, we proceed as follows. First is the title. The title of the graph is rainfall in the city. Rainfall in the city is the title of this graph. Second is label. Vertical label is rainfall in millimeters. And horizontal label is, the horizontal label is days. And vertical label is rainfall in millimeters. Next is scale. Vertical scale will mark 0, 10, 20, 30, 40, 50. And horizontal scale will mark 1, 2, 3, 4, 5 and 6. Here the vertical scale is 0, 10, 20, 30, 40 and 50. And horizontal scale is 1, 2, 3, 4, 5 and 6. As there are six days to be scaled. Next is points. Points to be marked on the graph are 140, 220, 335, 40, 810, 615. The points are 130, 220, 335, 40, 510 and 615. First is lines. Lines are to be drawn to connect these points here from the graph The lowest rainfall required is 0 millimeters. The highest required is 30 millimeters. This is the point of the lowest rainfall that is 0 millimeters. And this is the point of the highest rainfall that is 30 millimeters. Now let us see how to read the graph and how the graph helps in finding answers to certain questions based on the graph. Some comments we asked questions may be what is the title of the graph? From the graph we can see that the title is rainfall in the city. So, our answer would be rainfall in the city. Next question can be what is the range of the graph? As the graph scales from 1 to 6 on the horizontal axis. So, the range is 1 to 6. I answer would be 1 to 6. Next question may be what is the range of values on the vertical scale? Same shown on the vertical axis is 0 to 30. So, I answer is 0 to 30. Our next question is what was the least rainfall required? From the graph we can see that the curve touches the x-axis which shows that the least rainfall is 0 millimeters. So, our answer is 0 millimeters. Next question is what was the highest rainfall required? From the graph the highest point is at 30 millimeters which shows that highest amounts required is 30 millimeters. So, our answer is 30 millimeters. Our next question is at what point did the rainfall dip? Now we know that the graph dips at two points one on day two and the other on day four. So, the graph dipped at two points on day two that is 20 millimeters rainfall and on day four that is 0 millimeters rainfall. This completes our session. Hope you enjoyed this session.