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Year 8 Interactive Maths - Second Edition


Horizontal and Vertical Lines

The graph of a relation of the form y = 5 is a line parallel to the x-axis because the y value never changes.


Note:

A line parallel to the x-axis is called a horizontal line.


The graph of a relation of the form x = 5 is a line parallel to the y-axis because the x value never changes.


Note:

A line parallel to the y-axis is called a vertical line.


Example 8

Plot the graph of each of the following relations:

Solution:


Key Terms

horizontal line, vertical line


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