1. [5 points] Consider the linear system: 2x1 + 12x2 - X3 + X4 - 22xs =13 -6x, -36X2 + X3 +11x5 =-3 *1 + 6*2 + 4x5 = 2 The free variables of this system are (A) X2, X3 (B) X1 X3 (C)X X3, X. (D) X2, X5 (E) Xu, X2, X's (F) None of above 2. [5 points] A 2 X 2 matrix B satisfies the equation 38- - 4B= -I. The inverse of B is (A) -3B + 4 (B) 3B +41 (C) 3B - 41 (D) -3B + 41 (E) None of above