I'm stuck, can someone please help me solve (a) and (b) and explain (b)

2. (5 pts each) Consider the following matrix. 0 -3 6 A = NN 4 5 4 -4 -11 8 "Write the augmented matrix for the homogeneous system Ax = 0, and then write it in row reduced echelon form. 0 - 36 1 0 O -3 6 2 9 5 4 0 2 5 2 4 - 2 - 4 - 11 8 0 0 -612 0 0 0 6 0 2R, - K2= R3 R2+ R3 -7 Rg ( Augmented) - 4 -11 8 O 3 6 2 5 2 5 - 2 -7 - 11 8 O 6 R3 = - 12 Rg (b) Using the reduced matrix you found in part (a), circle the pivots. What are the basic variables? What are the free variables? How many solutions does Ax = 0 have