I do not understand how to find this answer. Can you help?

3. [0/1 Points] DETAILS PREVIOUS ANSWERS LARLINALG8 2.4.009. Let A and B be A = W W N 3 B : -1 W N W 1 OHN Find an elementary matrix E such that EA = B. 3 -1 -2 E = 2 3 3 1 X Need Help? Read It Talk to a Tutor 4. [-/1 Points] DETAILS LARLINALG8 2.4.011. Let A and B be 1 2 2 2 A = B 0 N -1 0 0 -1 1 2 -3 Find an elementary matrix E such that EB = A. E =