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find aan equation for he indicated parabola

1.focus(1,2), directrix x+y+1=0

2.vertex(2,0), directrix 2x-y=0

3.vertex(3,0), focus (0,1)

please tell me the steps how to find this 3 parabola equation...

1.focus(1,2), directrix x+y+1=0

2.vertex(2,0), directrix 2x-y=0

3.vertex(3,0), focus (0,1)

please tell me the steps how to find this 3 parabola equation...

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