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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.
paper plane
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 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.
A vertical plane is any plane where the normal (a line at 90 degrees to the plane) is horizontal. All your walls are vertical planes. The normal to the plane of the Earth's orbit is often used to define "up" and "down" for planet Earth. The Earth's axis is tilted at about 23.5 degrees away from this "vertical" line. Also you could define "vertical" as simply the direction shown by a plumb line. That's the definition which has walls as vertical planes. With either definition there will be more than one plane that is a vertical plane.
The y axis on the Cartesian plane is a vertical number line
The y axis
vertical - - - - - - - - - - horizontal -------------------------------
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
The coordinate plane is formed by the intersection of a vertical and a horizontal number line. What is the horizontal number line called?