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Find the equation of directrix of parabola x=-2at, y=-at 2

Find  the  equation  of directrix  of  parabola x=-2at,  y=-at2

Grade:11

1 Answers

Saranya Roy
24 Points
5 years ago
The equation of directrix is y=a.As the given parametric EQ.  satisfies the eq. X^2=-4aY.Thus vertex lies at (0,0) and focus and directrix are equidistant from the vertex.As it is a downward parabola so directrix is y=a

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