Question

Consider the set of vectors:
v1= (1) v2=(-2) v3= (2)
(-5) (10) (9)
(-3) (3) (h)
(these matrices are all 3X1)
a. For what values of the parameter h is v3 in the space spanned by v1 and v2?

b. for what values of the parameter h is the set {v1, v2, v3} linearly dependent?

Any help would be great!