+26 Find the standard equation of the parabola which satisfies the given conditions.
vertex (1,-9), focus (-3,-9)
vertex (-8,3), directrix x = -10.5
vertex (-4,2), focus (-4,-1)
focus (7,11), directrix x = 1
focus (7,11), directrix y = 4
vertex (-5,-7),vertical axis of symmetry, through the point P(7,11)
