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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.
positive
Rise of a line is a positive slope.
It will be the positive reciprocal of -6 which is 1/6.
If a line has a negative slope it is going 'down hill' and if it has a positive slope it is going 'up hill'