Greenwich mean time [gmt]
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It is a function. If the graph contains at least two points on the same vertical line, then it is not a function. This is called the vertical line test.
A line that is at right angles to a vertical line is said to be horizontal.
There is only one set of perpendicular lines in a right triangle; the horizontal line and the vertical line that make it 90 degrees.
The slope of a vertical line is undefined. Horizontal slope is 0.
A vertical line.