please could you help me ?

Question

http://www.nysedregents.org/testing/mathre/matharch/mathbtestja04.pdf

click on the site and tell me how to solve # 10

Answer 1

The answer is (2).

The key to this is in recognizing what type of curve each equation represents.
(1) is a hyperbola
(2) is an ellipse
(3) is a parabola
(4) is a circle

Number (2) is the only one that could possibly be the elliptical orbit of a planet.

Did you get that one right? Hope you did well on the test. Good luck.