A vertical number line is just a regular number line, except it goes down the page instead of across
^_^
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The name of a vertical line is simply named by the number on the x axis it is on.
A vertical line on a graph has infinite slope and no y-intercept. Its equation is [ x = a number ]. The number is the line's x-intercept.
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 depends on the rectangular what.
Because in a vertical line the slope is undefined, there is no "y" answer or "b" value and the line is in the form of x = some number such as x = 3 which is a vertical line.