Cartesian equation of plane that i perpendicular to plane and contains line

craka

By doing the cross product of the direction vectors of r=<5,0,0>+s<2,1,0>+t<-1,0,1> am I not find a vector perpendicular to the plane?

craka	By doing the cross product of the direction vectors of r=<5,0,0>+s<2,1,0>+t<-1,0,1> am I not find a vector perpendicular to the plane?