Question 1072187
Directrix y=-9.4, as if general point (x,-9.4).


Definition for Parabola and use of the Distance Formula:
{{{sqrt((x-0)^2+(y-9.4)^2)=sqrt((x-x)^2+(y-(-9.4))^2)}}}


{{{x^2+(y-9.4)^2=(y+9.4)^2}}}


{{{x^2+y^2-18.8y+88.36=y^2+18.8y+88.36}}}


{{{x^2-18.8y=18.8y}}}


{{{highlight(x^2=37.6y)}}}