It is the y-axis and the horizontal line is the x-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.
it is called the Cartesian Coordinate Plane
(0,0) = the origin
The coordinate plane is formed by the intersection of a vertical and a horizontal number line. What is the horizontal number line called?
A coordinate plane has two axes and four quadrants. The horizontal number line is called the x-axis and the vertical line is called the y-axis.
A continuous graph ?
The horizontal line in the Cartesian plane is called the x-axis or x-coordinate.
Coordinate plane
The xy or Cartesian or coordinate plane.
The vertical line is called the y-axis and the horizontal is called the x-axis.
"The" vertical line is wrong; there are lots of vertical lines on a coordinate plane. In the usual x-y coordinate system, such a line has an equation of the form:x = a (for some constant "a"); for example: x = 3