A particle moves along x2+2y2=9x^2 + 2y^2 = 9x2+2y2=9. At what point (x,y)(x, y)(x,y) in the first quadrant is dydx=−1\frac{dy}{dx} = -1dxdy=−1?
(3,3)(\sqrt{3}, \sqrt{3})(3,3)
(2,3.5)(\sqrt{2}, \sqrt{3.5})(2,3.5)
(6,1.5)(\sqrt{6}, \sqrt{1.5})(6,1.5)
(5,1)(\sqrt{5}, 1)(5,1)