It's m = y2 - y1/ x2- x1 It's m equals y2 minus y1 over x2 minus x1
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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
You cannot: the slope is not defined.