the force acts in the plane of triangle ABC , where A(2,3) ,B(1,-4) ,C(-1,0)

If moment about A = moment about B = 60 and moment about C =-60

Find vector F and its magnitude >>

this is my attempt ....

HTML Code:

<img src="http://im36.gulfup.com/RyhxH.jpg" width=400 height=400>

Is this correct?