Recently, I found an equation r(s,t)= r0 + sv + tw ,
which is a plane with a point and two vectors lying on it.
I don't know why this is an equation of a plane.
can anyone teach me how to interpret r(s,t)= r0 + sv + tw ?
is there a method to convert r(s,t)= (-3,4,-9) +s(9,-5,9) + t(3,-2,3) into the form (r-r0).n=0?