It means that the relationship between the x and y variables is not linear.
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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 has a negative slope it is going 'down hill' and if it has a positive slope it is going 'up hill'
If you mean: y = -5x then the slope of the line is -5 and there is no y intercept
If you mean y = -13x then the slope of the line perpendicular to it is 1/13
if you mean 3x + 4y = 8 the slope is -3/4 and any parallel line will have the same slope.