Question

Total left direction moments of a coplanar system of forces are given by G, 2G and 4G about the points (0,0) , (1,2) and (2,5) respectively. Find the magnitude and the equation of the line of action of the resultant. (G doesn't equal 0)

I know that the line of equation of the resultant is given by
G = G0 - Yx + Xy

Where G= moment of forcea about any point(let A),
G0 = moment of forces about point 0(origin) ,
Y,X = y an x components of the resultant force ,
x,y(x,y coordinates of point A)

Since there are no hints given on the magnitude of forces how do we solve this one?

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