Renee Descartes
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it is the slope formula in the equation it is the slope formula in the equation
the formula for slope is y=mx+b, a horizontal line has the slope of zero and the slope of a vertical line can be answered as undefined
formula
Use point-slope formula
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.