Wd p c vh, where vh is any solution of the equation ax d 0. 24.
a. if x is a nontrivial solution of ax d 0, then every entry in x is nonzero.
b. the equation x d x2u c x3v, with x2 and x3 free (and neither u nor v a multiple of the other), describes a plane through the origin.
c. the equation ax d b is homogeneous if the zero vector is a solution.
d. the effect of adding p