Question 143159
Formulae:
4p(y-k)=(x-h)^2 gives vertical parabola. (h,k)=vertex; focus=(h,p+k)  (p is the distance from the vertex to the focus)

thus
4py=x^2  is an equation with vertex at (0,0).

p+0=5 gives the y-value of the coordinate and the p value.
20y=x^2
y=(1/20)x^2 is the final equation.

Graph:

{{{graph( 300, 200, -10, 10, -10, 10, (1/20)x^2 )}}}