The parametric equations of curve C are

x=1/t

y=t²

a) Show that the tangent to C at the point P with parameter p has equation

y+2p³x-3p²=0

b) The tangent to the point C at the point P intersects the x-axis at A and the y-axis at B. Show that PB=2PA

I don't know how to do this question. I know how to find dy/dx but not sure if i need it never attempted one of these questions help pleaase =]