I need help with questions 7 and 12 please?
Extracted text: 米 (a) {(2, –3, 1), (4, 1, 1), (0, –7, 1)} (b) {(1, 6, 4), (2, 4, -1), (–1, 2, 5)} 7. In each part, show that the set of vectors is not a basis for R.
Extracted text: 米 S = {u1, u2} for R2. 12. Find the coordinate vector of w relative to the basis %3D (a) u, = (1, -1), u2 = (1, 1); w = (1, 0) %3D (b) u, = (1,-1), u2 = (1, 1); w = (0, 1) %3D %3D