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Mathematics 9 Online
OpenStudy (sainath):

find an equation of a parabola with a vertex at the origin and directrix y=-2.5

OpenStudy (sainath):

OpenStudy (sainath):

@zepdrix

OpenStudy (sainath):

@phi

OpenStudy (studyloverhojea):

Switch in the y as -2.5 and if it makes sense, then that's the answer.

OpenStudy (sainath):

y=-{1}/{10}x^2

OpenStudy (phi):

I think it's y = (1/10) x^2

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