The equation 49x^2 + 36y^2 = 1764 describes a certain closed curve in 2-dimensional space. (The caret (^) indicates that the variable to the left of the caret is to be raised to the power to the right of the caret. That is, "x^2" means "x squared" and "y^2" means "y squared".)
Determine the type of closed curve this equation describes, and express the x and y coordinates of the points on this curve as functions of a single (common) parameter.