Question

If A = 1 2 1
1 -4 1
3 0 -3
B= 2 1 1
1 -1 0
2 1 -1
show that AB = 6I*3* , (13 is the identity matrix of order 3)
utilize this result to solve 2x + y + z =5, x - y = 0, 2x + y -z = 1

Answer 1

Answer:

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