It is called a horizontal line!
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The coordinate plane is formed by the intersection of a vertical and a horizontal number line. What is the horizontal number line called?
The vertical line is called the y-axis and the horizontal is called the x-axis.
Not sure about the horizon number line but the horizontal line is sometimes called the x-axis.
x-axis * * * * * Not necessarily. The graph of y = 2 is horizontal but it is not the x-axis.
This is called a beam :)