Respuesta :

take any point (x,y) on the line 
distance between (x,y) and the focus = distance from the point to the directrix
s sqrt(x^2 + y^2)  = |x - (-6)|

x^2 + y^2 = x^2 + 12x + 36
y^2 = 12x + 36

that is the required equation

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