3- What does the following python code do? Explain it completely, line by line 1 import numpy as np 123456 PL 4 5 import sys a = np.array([[ 2, 1, -11, [-3, -1, 2], [-2, 1, 2]]).astype (float) 6 b [8, -11, -31 7 print (np.linalg.inv (a).dot (b)) 8n=a.shape [0] 9 det_a= np.linalg.det (a) 10 x= np.zeros (n) 11 for i in range (n): ai= a.copy () 12 13 ai[:,1]-b 14 x[i] = np.linalg.det (ai)/det_a 15 print (x)

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