if you mean the horizontal line on a graph t is refered to as the x axis or y=0
The x-axis.
line of latitude. or the x-axis
Vertical and horizontal lines in most graphs are called axes (plural of axis). They create the plane on which the graph sits. The X axis is the horizontal axis and goes across the graph. The Y axis is vertical axis and goes up and down the graph. They could also be lines which depict places that the graph never touches; this would be called an asymptote.
Here's one----
The rows (Horizontal) are called Periods and the Columms (Vertical) are called Groups.
slope
In the co-ordinate plane The horizontal number line is the 'x-axis'. The vertical number line is the y-axis. They intersect at the 'origin' ; coordinate (0,0) In the 3-dimensional system there is a third number line going from front to back , this is the z-axis. All three axes intersect at the origin , and have the the coordinates ( x,y,z) = (0,0,0)
The coordinate plane is formed by the intersection of a vertical and a horizontal number line. What is the horizontal number line called?
On the Cartesian plane the horizontal number line is the x axis.
On the Cartesian plane the horizontal number line is the x axis.
It is called the x axis and the vertical number line is the y axis
The horizontal number line on a coordinate plane is called the x-axis, and the vertical number line on a coordinate plane is called the y-axis.
Not sure about the horizon number line but the horizontal line is sometimes called the x-axis.
The vertical line is called the y-axis and the horizontal is called the x-axis.
x-axis
It is called a horizontal line!
The horizontal line is called the horizontal axis
Coordinate plane