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The existence of the unique solution of the system `x + y + z = lambda, 5x – y + mu z = 10, 2x + 3y - Z = 6` depends on

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unique solution,` |A| ne 0`

` Rightarrow[ [1 , 1 , 1], [5 , -1 ,mu], [2 , 3 , -1] ] ne 0 `

` Rightarrow 1(1-3 mu)-1(-5-2 mu)+1(15+2) neq 0 `

` ...
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