1) Eliminate t to give an equation that relates x and y.

x=(e^(2t))+9 and y=e^(7t)

2) Eliminate t to give an equation that relates x and y.

x=tan(t) and y=sec^2(t)-3

3) Show that this equation represents a circle by rearranging it into the centre-radius form of the equation of a circle. State the coordinates of the center and the radius of the circle:

21y^2+19x^2+83=4x-2x^2-84y

LOLWUT?! Help would be soo much appreciated.