Line Graph: Definition, Types and Uses

What Is Line Graph: It is a graphical representation of information into visual form. A Line graph can be created by using points that are connected by a line. It is used to understand the information quickly. There are two types of axis used in the line graph such as x axis known as horizontal axis and y axis called as vertical axis. Line graph is basically used in statistics. With the help of a line graph, we can display the data that changes continuously over the period of time.

Students learn line graph in their secondary classes in order to represent information in the form of graph. You can check NCERT Solutions for Class 8 Maths Chapter 15 for a better understanding of the concept. We have provided detailed information on line graph in this article. Read on to find out about its definition, types, uses and example.

What Is Line Graph?

Line graph is formed by joining the points in order to display the data that changes over the period of time. The line graphs were introduced by Nicolaus Samuel Cruquius, Francis Hauksbee, William Playfair and Johann Heinrich Lambert. It basically shows the relation between the points or information. There are three types of line graphs i.e., simple, multiple and compound.

How to plot a graph?

You need to draw the x axis and y axis on the paper.
Write down the title to show the purpose of the graph.
Plot a graph if you want to represent your earnings for five days in the form of line graph, then you need to place number of days in x axis and earnings on y axis.
You need to label the axis as per the factors.
Then, point the exact values on the graph. Once it is done, join the points into a line.

Types Of Line Graph

There are three types of line graph as mentioned below:

Simple line graph- It consists of a single line on the graph.
Multiple line graph- It consists of more than one line plotted on the graph.
Compound line graph- It consists of information that is divided into two or more types of data.

Parts Of Line Graph

There are different parts of line graph as mentioned below:

Title: It shows the representation of information that you want to convey.
Scale: It is the numbers represented on the graph.
Labels: It represents data in the graph where x axis shows the data points and y axis shows the numerical value.
Bars: It measures the data numbers in the graph.
Data Values: It represents numbers on each data point.

Uses of Line Graph

Some of the application of line graph are mentioned below:

It shows the data that changes over the period of time.
It is used in the field of mathematics, medicine, Science, engineering etc.

Download NCERT Solutions for Class 8 Maths Chapter 15 PDF

Example Of Line Graph

The example of line graph is given below:

Example 1: The following graph shows the temperature of a patient in a hospital, recorded every hour.
(a) What was the patient’s temperature at 1 p.m.?
(b) When was the patient’s temperature 38.5° C?

(d) What was the temperature at 1.30 p.m.? How did you arrive at your answer?

(e) During which periods did the patients’ temperature showed an upward trend?

Solution:

(a) From the given graph, we can observe that at 1 p.m., the patient’s temperature was 36.5 0C.

(b) From the given graph, we can observe that the patient’s temperature was 38.5 0C at 12 noon.

(d) From the given graph, we can see that the graph during the time 1 p.m. and 2 p.m. is parallel to x-axis which means the temperature is constant from 1 p.m. to 2 p.m. The temperature at 1 p.m. and 2 p.m. is 36.5 oC. So, the temperature at 1: 30 p.m. is also 36.5 oC.

(e) From the given graph. We can infer that during the following periods, the patient’s temperature showed an upward trend. 9 a.m. to 10 a.m., 10 a.m. to 11 a.m., 2 p.m. to 3 p.m.

FAQs On Line Graph

The frequently asked questions on line graph are:

Q. What is line graph?
A. It is a graphical representation of information into visual form.

Q. What are the parts of line graph?
A. The parts of line graphs are title, scale, data values, bars and labels.

Q. What are the types of line graph?
A. The types of line graph includes simple, multiple and compound.

We hope this detailed article on Line Graph helps you. If you have any queries, feel to drop a comment below. We will surely assist you. Embibe wishes you all the best!