A 3.70 kg particle has the xy coordinates (-1.36 m, 0.522 m), and a 5.25 kg particle has the xy coordinates (0.819 m, -0.792 m). Both lie on a horizontal plane. At what (a) x and (b) y coordinates must you place a 2.76 kg particle such that the center of mass of the three-particle system has the coordinates (-0.259 m, -0.663 m)?