Find the standard form of the equation of the parabola with a focus at (0, -9) and a directrix y = 9.

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Answer Choices:
A. y = -1/9x^2
B. y^2 = -36x
C. y = -1/36x^2
D. y^2 = -9x

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What's the formula for parabola? How can you plug it into the formula?

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