The equation of the directrix of the parabola $${y^2} + 4y + 4x + 2 = 0$$

If the line $$x - 1 = 0$$ is the directrix of the parabola $${y^2} - kx + 8 = 0,$$ then one of the values of $$k$$ is

If $$x + y = k$$ is normal to $${y^2} = 12x,$$ then $$k$$ is

If $$x$$ $$=$$ $$9$$ is the chord of contact of the hyperbola $${x^2} - {y^2} = 9,$$ then the equation of the vcorresponding pair of tangents is