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A vertical line is neither positive nor negative because the slope is undefined. An undefined slope creates a vertical line, hence no slope to calculate. An example of a vertical line would be x=2 or a "slope" of 2/0 (undef. slope). In addition, a vertical line is not even a function because it has repeating input(x) values.
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Why is the line x equals 4 a verticle line?
The line x = 4 is a verticle line because, in a standard x-y graph, where x increases to the right and y increases upwards, the graph x = 4 is all points y, where x is 4. That is a verticle line, with infinite slope.
Does positive and negative time axis exist?
a line
Why is the number line of a number is never negative?
A number line can have both positive and negative numbers. You can put the number line in any position, but often it is represented so that numbers to the right of zero are positive, and numbers to the left of zero, negative.
What is an integer number line?
a number line that has both a positive side and a negative side.
What does it mean for a line to have a negative slope?
If a line has a negative slope it is going 'down hill' and if it has a positive slope it is going 'up hill'
