Question 1012211
{{{y^2+4x=0}}}
{{{4x=-y^2}}}
{{{x=-(1/4)y^2}}}


This will help for focus and directrix:
Instructive video:  <a href="https://www.youtube.com/watch?v=M8LGsQMwwj4">parabola equation, vertex at origin</a>