what could be explained from the straight horizontal line observed at the beginning and end of the graph
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The graph of a relation of the form y = 5 is a line parallel to the x-axis because the y value never changes.
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.
A line parallel to the y-axis is called a vertical line.
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