The first order derivative function is  and tangent line is .

The tangent line is .

Rewrite the tangent line.

Hence the slope of the tangennt line is .

But first order derivative function is the slope of the tangent line.

              ( Since  )

Now substitute  in a tangent line.

Therefore the point of tangency is .

The first order derivative function is .

The antiderivative of  is

Therefore the function is .

Substitute  and  in .

Hence the function is .

Graph :

Graph the function  :

(1) Draw the coordinate plane.

(2) Sketch tangent line  at a point .

The function is .