Im trying to figure out the following: can someone tell me the process and I will try and work it on my own. I am just not sure how to work it out.
Let S be the subspace of R^4 with the vectors as basis:
(1,1,0,-1) (1,3,0,1) (-1,0,1,8)
a) Show that the (6,9,-9,-9)^T is in S