# Double Line Graph: Definition & Examples

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• 0:00 What Is a Double Line Graph?
• 1:13 Constructing a Double…
• 1:57 Examples of Double Line Graphs
• 2:53 Lesson Summary

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Lesson Transcript
Instructor: Cory Haley
We will explore the function and examples of a double line graph. In this lesson, you will also learn to create questions and interpret data from a double line graph.

## What Is a Double Line Graph?

First, let's review what is a line graph? A line graph is a graphical display of information that shows a continuous change. The lines in a line graph can ascend and descend based on the data. Within a line graph the data points connect. We can use line graphs to show a comparison with events, situations, and information. A line graph may also be referred to as a line chart.

A double line graph is a line graph with two lines connecting points to show a continuous change. Just like a line graph, the lines can ascend and descend in a double line graph. A double line graph has two axes. The x-axis of a double line graph shows the occurrences and the categories being compared over time, and the y-axis represents the scale. A scale is a set of numbers that represents the data and is organized into equal intervals. A double line graph must have a title, which provides a general overview of what is being displayed. A double line graph will also include a key, which represents the information, event, and situation being observed.

## Constructing a Double Line Graph

Let's look at an example. The first step in creating a double line graph is to provide a title for the double line graph. The title of this double line graph is 'Average Snow Fall.'

Second, draw and label the two axes: the y-axis, which is the scale with equal intervals and ranging from 0-4, and the x-axis, which is the specific category observing the continuous change in the data. The y-axis has the label of 'Inches,' and the x-axis has the label of 'Months.'

Third, draw the double lines to show the data continuously changing over the observed time period. Finally, provide a key. The key for this double line graph represents the two cities that are being compared.

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