The system of linear equations 3x - 2y - kz = 10 2x - 4y - 2z = 6 x+2y - z = 5m is inconsistent if :

Question

The system of linear equations
3x - 2y - kz = 10
2x - 4y - 2z = 6
x+2y - z = 5m
is inconsistent if :

k $ \ne $ 3, m $ \in $ R

k = 3, m $ \ne $ ${4 \over 5}$

k = 3, m $ = $ ${4 \over 5}$

k $ \ne $ 3, m $ \ne $ ${4 \over 5}$

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