Pre-calculus? parametric functions?

Notice that if you just plug in into the equation for , you end up with



You have to do the same thing with the given choices. For example, if



then we see that , and plugging this into the second equation gives



which matches the original set of parametric equations.

So the general strategy is to eliminate the parameter by solving for it in each equation. Then substitute this result for the in the corresponding equation, and see if it reduces to the same equation at the top.