Write each vector as a linear combination of the vectors in S. (Use $s_1$ and $s_2$, respectively, for the vectors in the set. If not possible, enter IMPOSSIBLE.)
S = {(1, 2, -2), (2, -1, 1)}
(a) z = (-12, 1, -1)
z =
(b) v = (-1, -6, 6)
v =
(c) w = (-4, -18, 18)
w =
(d) u = (1, -6, -6)
u =