HALLIDAY SOLUTIONS - CHAPTER 9 PROBLEM 2 - Fundamentals of Physics 10th

Figure 9-35 shows a three-particle system, with masses m1 = 3.0
kg, m2 = 4.0 kg, and m3 = 8.0 kg. The scales on the axes are set by xs = 2.0 m and ys = 2.0 m.What are (a) the x coordinate and (b) the y coordinate of the system’s center of mass? (c) If m3 is gradually increased, does the center of mass of the system shift toward or away from that particle, or does it remain stationary?

[Asncalculus]

I need your explainations.Following this book.