paper plane
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 the vertical number line on the y axis in the Cartesian plane
That depends. How tough do you think it would be to draw a horizontal line or a slanting line on the wall ?
A vertical line in the xy coordinate plane would represent the line of an equation such as x = 1 or x = -4.
The coordinate plane is formed by the intersection of a vertical and a horizontal number line. What is the horizontal number line called?
paper plane
"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
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.
The y axis on the Cartesian plane is a vertical number line
There is no specific vertical plane on Earth as it is a 3-dimensional sphere. However, if you are referring to the vertical plane passing through the poles, it would intersect the surface at the North and South Poles.
vertical - - - - - - - - - - horizontal -------------------------------
The y axis
No, indeed the line *could* be horizontal. A vertical plane is like the face of a wall, whiteboard or a computer screen (assuming each is actually vertical). Any combination of dots/pixels on those surfaces can be joined up in one way or another to form a line, straight, curved or angular. Because every point on that line is on the vertical plane, the line must also be on the vertical plane. It is easy then to see that a perfectly horizontal line, such as those seen bounding every box on this website, can still be part of a vertical plane. It just so happens that, in that very special case, it also belongs to another set of lines that lie on a horizontal plane.
The coordinate plane or grid.
The vertical number line which helpd to form the coordinate plane
It is the vertical number line on the y axis in the Cartesian plane