yust easy man. you must try to eleminate the parametric term.or use differentiation to solve it man.

like the common question

x=t²+t+1, and y=t²-t+1

x+y=2(t²+1), t²=(x+y-2)/2 --------(1)

x-y=2t, t=(x-y)/2 ,  t²=(x-y)²/4 -------(2)

hence, (x-y)²/4=(x+y-2)/2

 

give me the rating man for my work