$17\mathrm{.}2$ Choose the correct formula for the vector field.

vec$(F)(x,y)=-$xvec$(i)+$yvec$(j)$

vec$(F)(x,y)=$xvec$(i)$

vec$(F)(x,y)=$xvec$(i)-$yvec$(j)$

vec$(F)(x,y)=-$xvec$(i)-$yvec$(j)$

vec$(F)(x,y)=$xvec$(i)+$yvec$(j)$