differentiation

The equations of two curves are:
C1 : 2x ^2 + y^2 = 24
C2: y^2 = 8x

(a)find the point of intersection P of the curves.
(b). find dy/dx for the curve C1.
(c). find dy/dx for the curve C2.
(d). Show that the tangents to the curves at P are perpendicular to each other.