How Do You Calculate the Center of Mass for Multiple Objects?

[Shadow_C316]

Three balls with masses of 5 g, 1 g, and 7 g,
respectively, are connected by massless rods.
The balls are located (in meter intervals) as
in the figure.

Imagine the first quadrant of a graph.
The 5 gram is at point (3,8)
The 7 gram is at point (5,2)
The 1 gram is at point (9,6)

What do do to find the center of gravity? I've looked online and I only see formulas for 2 objects instead of 3 so I'm stuck. Forgot to say they are all connected by massless rods.

 

[henry2221]

the sum of the equations...

 

[Shadow_C316]

Sum of what equations?

 

[henry2221]

the sum of the center mass equation... and you got to break it down into y and x... there is an similar example online, i'll look it up for you

 

[henry2221]

Center of Mass for Particles

http://hyperphysics.phy-astr.gsu.edu/HBASE/cm.html

 

[Shadow_C316]

Thanks so much! Would the answer be:

In the X direction
((5x3) + (7x5) + (1x9))/13=4.54

In the Y direction
((5x8) + (7x2) + (1x6))/13=4.6