Test 5: 12.2 12.6 MAC 1140: Precalculus Algebra November 21 2013 1. Determine whether each matrix is in row echelon form. If it is determine whether the matrix is in reduced row-echelon form. a. b. c. d. e. f. 2. Use Gauss-Jordan Elimination to solve the systems below. a. b. c. 3. Solve the following systems of equations. a. c.