The vector JB is:
[tex]\vec{JB}=\vec{B}-\vec{J}=(1-3,5-7)=(-2,-2)[/tex]The component form is to write a vector in the form:
[tex]ai+bj\text{ }[/tex]Where the vector is (a, b).
We know the vector JB is (-2, -2), thus, in component form:
[tex]-2i-2j[/tex]