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If A = [(1,2,1)(-1,1,1)(1,-3,1)(1,-3,1)], find A^-1.Hence solve the system of equations: x+2y+z = 4, -x+y+z = 0, x-3y+z = 4.

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If A = [(1,2,1)(-1,1,1)(1,-3,1)(1,-3,1)], find A-1.Hence solve the system of equations: x+2y+z = 4, -x+y+z = 0, x-3y+z = 4.

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Multiplying both sides by A-1 we get

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