Up and down 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.
graphing tool
The coordinate plane is formed by the intersection of a vertical and a horizontal number line. What is the horizontal number line called?
Graphing or plotting.
It can be just about anything, depending what you are graphing.
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.
"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
Coordinate plane worksheets are needed for fourth grade and up because fourth grade is when you learn basic graphing and that is when you would need a coordinate plane worksheet.
The vertical axis in a plane coordinate graph
The vertical axis in a plane coordinate graph
Coordinate plane
The first is 2-dimensional, the second is 1-dimensional.