Not sure about the horizon number line but the horizontal line is sometimes called the x-axis.
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Establish a horizon line and a vanishing point
vertical
The coordinate plane is formed by the intersection of a vertical and a horizontal number line. What is the horizontal number line called?
what is a line that shows a number in order using a scale is called what is it called
The number above the line in a fraction is called the numerator. The number below the line is called the denominator. So in the fraction 5/7 5 is the numerator and 7 is the denominator.