[deltay]/[deltax]
If you don't understand that:
y1-y2/x1-x2
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If the slope is undefined, it is a vertical line. Therefore the equation is x=2.
If you mean points of (2, 4) and (4, 2) then the slope is -1
Slope = (8 - 0)/(0 - 4) = -2
Points: (1, 2) and (3, 8) Slope: 3
Points: (14, 5) and (20, 4) Slope: -1/6