Question 1025783
Imagine parabola with vertex at the origin on a coordinate system, and focus is (0,6).  The directrix is the line (x,-6).  You can derive the equation of the parabola according to the definition of a parabola and using the Distance Formula.


See and study this video for help on this: <a href="https://www.youtube.com/watch?v=M8LGsQMwwj4">Derive equation for a parabola given focus and directrix, for vertex at Origin</a>