Exercise 2 Use Gauss-Jordan elimination to solve the following system of linear equations: Exercise 3 2x+3y-z = 1 3x + 5y + 2z = 8 x-2y-32=-1. Show that vectors u = (1, 1, 1), u = (0, 1, 1) and us = (0, 0, 1) are linearly independent. Present u = = (-1, 2, 4) as a linear combination of u, U, and u3.