$(1$ point$)$ Find a formula for F$=$F$1($x$,$y$),$F$2($x$,$y$)$F$=$F$1($x$,$y$),$F$2($x$,$y$)$ if this $2$D vector field satisfies these properties:

a$)$ F$$F$$ is not defined at the origin

b$)$ at any other point $($x$,$y$)(0,0)($x$,$y$)(0,0),$ the vector field F$$F$$ points toward the origin, with magnitude inversely proportional to the cube of the distance from $($x$,$y$)($x$,$y$)$ to the origin