Step 1: Calculate the slope of the curve

            Skill 1: Note down the given curve equation and apply the differentiation on

            both sides

                  NOTE: Multiple both sides of the function by \frac{dy}{dx}  

            Skill 2:  Differentiate both sides of the function with respect

            to x (any  variable).

            EXAMPLE: y = x^3 - 2x^2 - x + 9

                              [math] \frac{d}{dx} y = \frac{d}{dx}[x^3] - \frac{d}{dx} [2x^2] -\frac{d}{dx} x + \frac{d}{dx} 9][/math]

                               \frac{dy}{dx} = 3x^2 - 4x - 1

            Skill 3: Plug in (x, y) values to find ( \frac{dy}{dx})

            for that point. 

          Skill 4: To know the slope (gradient), apply the BODMAS rules to simplify

            the  equation.

Step 2: Use the slope of curve and a point on curve to find its y-intercept.

Step 3:Use the slope of line and the y-intercept of line to find the equation of the line.

EXAMPLE: Plug the slope m = -2 and the y-intercept b = -8 into the slope- intercept formula.

y = mx + b

y = -2x + -8