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Let A and B be two matrices of the same ...

Let A and B be two matrices of the same order `3xx3` such that `A=[(-5,1,3),(7,1,-5),(1,-1,1)] and B=[(1,1,2),(3,2,1),(2,1,3)]
x+y+2z=1, 3x+2y+z=7`and`2x+y+3z=2` be a system of equatons in x,y,z The value of AB and hence solve the system of equation
(A) `[(-5,1,5),(21,2,-5),(2,-1,3)]` (B) `[(4,0,0),(0,4,0),(0,0,4)]` (C) `[(0,0,1),(0,1,0),(1,0,0)]` (D) `[(2,-5,1),(1,3,6),(0,0,-0)]`

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