That line is popularly known as the 'x-axis'.
That is a common spelling of the proper given name of Japanese origin, Mikiya.
For simplicity consider a force whose direction does not correspond to either the x- or y-axis. At the head of the force (where the arrow is) draw a vertical line to the horizontal axis and a horizontal line to the vertical axis. The force is now enclosed by the lines you have drawn and the axes and this enclosure is a rectangle. Since a rectangle is also a parallelogram this means that you have also resolved the given vector into two components, namely, the one given by the portion of the horizontal axis between the origin and where your vertical line meets that axis, and the one given by the portion of the vertical axis between the origin and where your horizontal line meets that axis. These two vectors are the rectangular components of the given force.
For simplicity consider a force whose direction does not correspond to either the x- or y-axis. At the head of the force (where the arrow is) draw a vertical line to the horizontal axis and a horizontal line to the vertical axis. The force is now enclosed by the lines you have drawn and the axes and this enclosure is a rectangle. Since a rectangle is also a parallelogram this means that you have also resolved the given vector into two components, namely, the one given by the portion of the horizontal axis between the origin and where your vertical line meets that axis, and the one given by the portion of the vertical axis between the origin and where your horizontal line meets that axis. These two vectors are the rectangular components of the given force.
Without the inclusion of an equality sign and not knowing the plus or minus values of the given terms it can't be considered to be a straight line equation
All of the elements in a given horizontal row (or period) have the energy level, but they differ in the number of valence electrons.
It's an old common Arabic name , and it is one of the names that are given to the lion.
That's the "Y-axis".
Datum is latin for "That which is a given, that which is taken for granted." Its plural is the more common "Data."
the x-axis
The axes of any chart should be labelled. Usually the horizontal axis is the x-axis and the vertical axis is the y-axis. But, if you are given a square piece of graph paper with two axes on it and either a scatter plot or a line, and no labels nor data then you do not have a chance.
If you mean in a 2-dimensional plane, the two ways I know of are Cartesian coordinates and polar coordinates. In the Cartesian coordinate system, there are 2 perpendicular axes, a horizontal and vertical (usually these are label x and y respectively). In this system, position is given by the distance from the origin (the center of the grid where x and y = 0) in the x and y direction. For example, if a point is 3 units away from the origin in the horizontal direction and 1 unit in the vertical the direction, the point is at (3,1) ( the 3 is the x and the 1 is the y). In polar coordinates, the position of a point is given by its distance from the origin (r) and the angle the line r makes with the horizontal axis. This angle is positive in the counterclockwise direction from the right side horizontal axis.
x