Let { u1, u2, ..., uk } be a linearly independent set of vectors in Rn, and let v be a vector in Rn such that v = c1u1 + c2u2 + ... + ckuk for some scalars c1, c2, ..., ck with c1 not equal to 0. Prove that { v, u2, ..., uk } (NOTE: NO u1) is linearly independent.