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A horizontal line has a slope of 0. If you're using the slope formula, then when the numerator is equal to 0 then the slope is 0.
For a horizontal line, the slope is zero. Using the formula y=mx+b, where m is the slope.
A line with slope of zero is horizontal. A line with no slope is vertical because slope is undefined on a vertical line.
From the given points the slope of the line works out as 3/4
The lines below are perpendicular. If the slope of the green line is -1, what is the slope of the red line?