SOLUTION: a parabola has focus at (0,3) and vertex at the origin. which could be the equation of the directrix

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Question 878663: a parabola has focus at (0,3) and vertex at the origin. which could be the equation of the directrix
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
The directrix is on the other side from the vertex, same distance from it. Look three units downward to know where is the directrix. This includes the point (0,-3), and will be the line for all (x,-3). The directrix is the line highlight%28y=-3%29.