Math hwk I need some help augmented matrix and gaussian elimination.

Practice Exercises In Exercises 18, write the augmented matrix for each system of . . In Exercises 2138, solve each system of equations using matrices. linear equations. Use Gaussian elimination with back-substitution or Gauss-Jordan x _ y + z = 8 elimination. 3. y12z=15 z= 1 x+ y z=2 ' 21. 2x y+ z 5 x+2y+2z= 1 In Exercises 912, write the system of linear equations represented by the augmented matrix. Use x, y, and z, or, if necessary, w, x, y, and z. for the variables. :1 :3 2 11. _ _ = 2 0 0 5 11 27. x y z 0 0 0 12 4 5 x y + Z = 2 In Exercises 1318, perform each matrix row operation and write W + x + y + Z = 4 the new matrix. 2w + x 2y z = 0 35. 1 3 20 w2xy2z=2 15. 3 117 3R1+R2 3w+2x+y+32= 4 2 2 1 3 Practice Plus 39. Find the quadratic function f(x) = ax2 + bx + c for which f(2) = 4,f(1) = 2, and Z) = 0