Pregunta: Let vec(v)=3vec(i)+9vec(j) and vec(w)=3vec(i)+8vec(j).Find an exact number c so that vec(w)-cvec(v) is perpendicular to vec(v).c=

Let vec$(v)=3$vec$(i)+9$vec$(j)$ and vec$(w)=3$vec$(i)+8$vec$(j).$

Find an exact number $c$ so that vec$(w)-$cvec$(v)$ is perpendicular to vec$(v).$

$c=$