Students are trying to solve the linear system by using Gauss-Jordan elimination. They performed some elementary row operations and got to a point where they have following matrix: -4 3 1 1 1 -1 2 -1/2 4 Now, they want to get 0 in place of entry a12. (Row one, column two) a) What should be the entries for the new row 1? Only write entries of row 1 separated by a comma, No Brackets, No Space. For example: 1,0,5/6,3/7 [3 marks] b) Continue with elementary row operations and find the solution to this system. Write solution in this order: x, y,z and must be separated by a comma, No Brackets, No Space. For example, 0,1,2. If solution is parametric, use letter t as a parameter for free variable. Place the term containing the letter t at the end of the expression. For example: 4+t,-1+2t,t [2 marks]