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X=5 is a vertical line, so it has no slope. When I say it has no slope, I don't mean the slope is 0, I mean the slope is nonexistent.
If a line on a graph is rising as it goes from left to right, it has a positive slope. If it is falling from left to right (or rising from right to left) it has a negative slope. If it is horizontal, it has a slope of zero.
If you mean y = 11x then the slope is 11
If a line has a negative slope it is going 'down hill' and if it has a positive slope it is going 'up hill'
If you mean: (0, 1) and (2, 7) then the slope works out as 3