From the given data:

Conic is parabola,

Eccentricity is e = 1, and

Directrix is .

So, the directrix is horizontal and below the pole.So we can choose the equation is

The eccentricity of a parabola is e = 1 and the distance between the pole and

the directrix is p = 4.

                  (Substitute the values :e = 1 and p = 4)

                        (Simplify)

The polar equation is .