EDIT: I think i screwed up and posted in the wrong section. Sorry. Should i make a new one to the correct place? Can this one be moved? Hello. I have a couple of problems here, that i will have to translate from another language, so im not 100% sure if im using the correct terms. (1) Let u, v, w ∈ ℝn be vectors. Find out if the vector u+v is an element of the group (subset?) (2u-v, 2u-w, 2w-u). (2) Show that the ℝn vectors u=(a,1,-1), v=(b,-1,2) and w=(c,1,3) are linearly dependant exactly when c-4b-5a=0. So, i dont know what to do with these.