Vertical and horizontal lines in most graphs are called axes (plural of axis). They create the plane on which the graph sits. The X axis is the horizontal axis and goes across the graph. The Y axis is vertical axis and goes up and down the graph. They could also be lines which depict places that the graph never touches; this would be called an asymptote.
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The x axis is the horizontal axis. The y axis is the vertical axis.
slope
The height of collimation is the height of the line of sight. It is the vertical distance of the horizontal plane through a telescope.
if you mean the horizontal line on a graph t is refered to as the x axis or y=0
We would need to know exactly what graphs you want explained. A bar graph is used to show different values of two or more subjects. It uses horizontal and vertical bars that represent a different value. A line graph compares two different types of information by showing how they are similar and different. A pie chart is designed to show the difference between two separate subjects.