x-axis
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Not necessarily. The graph of y = 2 is horizontal but it is not the x-axis.
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It is called a horizontal line!
It's the x axis.
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.