Find the equation of the parabola with vertex at (0,0) from the description of the focus and directrix and plot the parabola, the focus, and the directrix.
1. Focus (4,0), directrix x = -4
2. Focus (0,-6), directrix y = 6
3. Focus (-2,0), directrix x = 2
4. Focus (0,3), directrix y = -3

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