Line Graph
If the set of data varies with time, we generally use a line graph to represent them. In a line graph, the data are usually plotted against time and each pair of adjacent data points is joined by a straight line segment. The main advantage of using a line graph to represent data is that we can observe the trend of the movement of data.
How to Draw a Line Graph?
Example 1: The following table shows the jeans manufactures by a company in 5 consecutive days of a month.
Days | Mon | Tue | Wed | Thu | Fri |
No. of jeans | 3154 | 3130 | 3115 | 3125 | 3150 |
Draw a line graph to represent the above data.
Solution: The line graph of the data is shown below.
Linear Graph
If the line graph drawn is a single straight line, then the graph is called a linear graph.
How to Draw a Linear Graph?
To draw a linear graph, we need to locate some points on the graph paper. We know how to plot the points on a graph paper. Join these points. If the line joining these points is a straight line, then it is a linear graph.
Example 2: The following table shows the
distance travelled by a car using the given petrol.
|
Petrol (in litre) |
1 |
2 |
3 |
4 |
5 |
|
Distance travelled (in km) |
10 |
20 |
30 |
40 |
50 |
Draw a linear graph to represent the above data.
Solution: To represent the given data using a linear graph, let
1 unit = 1 litre on x-axis and 1 unit
= 10 km on the y-axis.
A linear graph is always a line graph but a line graph may or may not be a linear graph.
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