1 Given the following system of linear equations: x, + x2 + 2x2 = a 2x, + dx2 3x2 = b 3x, + 6x2 5x2 = 0 = C 1 Where a, b, c are the last three numbers of your Student ID, respectively. And, d=2(r)+1, where r is the 5th digit of your Student ID. Transform these system of linear equations into a matrix and convert it into row echelon form. Then perform the backward substitution to get the values of **, x,x, and x 1'2' 2