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SLOPE is the tangent drawn to the line making an angle with the positive X-axis.

slope(m) = tan(theta) or( y2-y1) /(x2-x1)

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The slope of a straight line is the steepness of the line with respect to the x axis.

It is the increase in y coordinate (ordinate) with respect to the increase in the (abscissa) x coordinate, as we move from left to right on the straight line.
   The way to find it is :   take two points on the line.   A(x1,y1) and B(x2,y2)
if x1 = x2, then slope is infinity.
        slope = (y2-y1) / (x2-x1)

Slope is also equal to the tangent of the angle made by the straight line L with the positive x axis.
    a x + by + c = 0  is the equation.    then  slope = - a/b

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