1. The problem statement, all variables and given/known data A 2.80 kg particle has the xy coordinates (-2.00 m, 0.950 m), and a 3.30 kg particle has the xy coordinates (0.672 m, -0.0440 m). Both lie on a horizontal plane. At what (a)x and (b)y coordinates must you place a 3.39 kg particle such that the center of mass of the three-particle system has the coordinates (-0.663 m, -0.527 m)? 2. Relevant equations 3. The attempt at a solution I don't even know what equation I have to use to find this, I looked in the book and I can't find anything about it. Can anyone help me with this?