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Two bodies of masses 1kg and 3kg are lyi...

Two bodies of masses `1kg` and `3kg` are lying in `xy` plane at `(0,0)` and `(2,-1)` respectively. What are the coordinates of the centre of mass ?
Hint. `x_(cm)=(m_(1)x_(1)+m_(2)x_(2))/(m_(1)+x_(2))`, `y_(cm)=(m_(1)y_(1)+m_(2)y_(2))/(m_(1)+m_(2))`

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`x_(cm)=(1xx0+3xx2)/(4)=(6)/(4)=(3)/(2)`
`y_(cm)=(1xx0+3xx(-1))/(4)=-(3)/(4)`
`(x_(cm),y_(cm))=((3)/(2),-(3)/(4))`
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