Could you please review the figures in the attached screenshot and confirm that I chose the correct answer, and if not, explain what I did wrong?

Figure 4 Write the augmented matrix for the system. 6x1 + 4x2 = 30 8x2 = 72 O A . O B. [ 30 4 6 72 0 8 O D. [ 6 4 30 0 8 72 Figure 5 Write a system of equations associated with the augmented matrix. Do not try to solve. O A. 8x = - 9 x+y= -7 - 6x - 5y = 8 O B. 8x+y= -9 x - 7y= -7 - 6x - 5y = 8 O C. 8x+y+z= -9 x - 5y = -7 Figure 6 Perform the indicated row operations on the following matrix. 1 - 5 4 2 2 5 - 3R1 - R1 O B. [ -3 15 -12 Oc. [ -3 - 5/ 4 ] O D