I'm having some trouble with these 2 question on spanning, my prof has not given us any examples and I can't find any help from the book, any help would be awesome.

1. Let u,v be two vectors in R^n. Show that

span{u,v} = span{2u + 3v, u + 2v}

2. Let u,v,w be two vectors in R^n. Show that

span{u,v,w} = span{u + v, u + w, v + w}