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To find the slope of any line y = f(x) differentiate with respect to x: slope = dy/dx; the slope at any point can then be found by substituting the value of the x coordinate of that point.

If you mean how to find the slope of a straight line:

slope = change_in_y/change_in_x

Taking any two points on the line (x0, y0) and (x1, y1) this becomes:

slope = (y_of_first_point - y_of_second_point)/(x_of_first_point - x_of_second_point)

→ slope = (y1 - y0)/(x1 - x0)

As it doesn't matter which is chosen as the first point, the slope can also be written as:

slope = (y0 - y1)/(x0 - x1)

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