(i) Find the range of values ofkfor which the equation

x^2-4x+k=5kx-4 has real roots

(ii) Hence, deduce, giving a reason, the relationship about the curve

y=(x-1)^2 and the liney=-5x-4

I've solved part (i), the range isk>=0 ork<= -36/25

I can't deduce the relationship for part (ii). Can anyone help??

Thanks!!!!