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 .