You are describing a circle, with its center at the origin and a radius of 4 (the square root of 16)
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It is the equation of a parabola.
It is the Cartesian equation of an ellipse.
A linear equation ?
Graph and Table: http://i50.tinypic.com/szhr4k.png
The center of the circle given by the equation (x - 3)2 plus (y + 2)2 = 9 is (3,-2).