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The system of linear equations x + y + z = 2, 2x + y – z = 3, 3x + 2y + k = 4 has unique solution, if k is not equal to ______ (a) 4 (b) 0 (c) -4(d) 1 |
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Answer» (b) 0 \( \begin{vmatrix} 1 & 1 & 1 \\ 2 & 1 & -1 \\ 3 & 2 & k \end{vmatrix} \) = k + 2 - (2k + 3) + 1 \(\ne\) 0 = k \(\ne\) 0 |
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