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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.
Equation 7 is not an equation and so cannot have a slope.
The slope equation is y = mx + b where m is slope for y = 3 we have y = 0 (x) +3 so m = 0 = slope So slope is zero line is constant y = 3
y is equal to a constant, so the slope is zero.
if you define y = constant then the slope of any constant is 0 so if you define the line y = 0 the slope of 0 is 0.