# Horizontal Line

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## Definition of 'Horizontal Line'

A horizontal line is a line drawn on a graph that connects two or more points with the same y-coordinate. It is used to show the relationship between two variables, where the x-coordinate represents the independent variable and the y-coordinate represents the dependent variable.

The slope of a horizontal line is zero, which means that there is no relationship between the two variables. This is because the y-coordinate does not change as the x-coordinate changes.

Horizontal lines can be used to represent a variety of things, such as:

* The relationship between two variables that are not related
* The average value of a set of data
* A constant value

Horizontal lines are often used in graphs to make it easier to see the relationship between two variables. They can also be used to highlight certain features of a graph, such as the average value of a set of data.

Here is an example of a graph that uses a horizontal line to represent the average value of a set of data:

[Image of a graph with a horizontal line]

In this graph, the horizontal line represents the average value of the data points. The data points are scattered around the horizontal line, which shows that there is some variation in the data. However, the average value of the data is still clear, which is what the horizontal line is used to show.

Horizontal lines are a useful tool for visualizing data and understanding the relationship between two variables. They can be used to highlight important features of a graph and to make it easier to see the overall pattern of the data.

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