Let P = (xp, yp) and Q = (xq, yq) by any two distinct points on the line.
If xp = xq then the slope is infinite.
Otherwise, it is (yq - yp)/(xq - xp) = (yp - yq)/(xp - xq)
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Take two points and plug them into the equation (y2 - y1)/(x2 - x1) to find the slope of a line.
Negative 0.2
Its steepness is the absolute value of its slope.
A single point cannot determine the slope of a straight line. It can, therefore, have any slope at all.
Slope = (y1-y2)/(x1-x2)
Where are the points!