Determine the work done by the force

F $=(6\mathrm{.}20$x$+6\mathrm{.}80$y$)$ N$/$m

acting on an object as it moves in the following manners.

$($a$)$ along the x axis from xi $=0$ to xf $=6\mathrm{.}31$ m

$123$ J

$($b$)$ along the y axis from yi $=0$ to yf $=4\mathrm{.}30$ m

$62\mathrm{.}9$ J

$($c$)$ from the position $($xi$,$ yi$)=(0,0)$ to the position $($xf$,$ yf$)=(6\mathrm{.}31$ m$,4\mathrm{.}30$ m$)$