What is the equation of a parabola with (4, 6) as its focus and y = 2 as its directrix.

http://www.mathwarehouse.com/quadratic/parabola/focus-and-directrix-of-parabola.php

https://picload.org/image/riawgiia/86.jpg

I need help with same question but the website you gave didn't make any sense to me or show me how to solve..?