1.

Let (a,b,c)ne(0,0,0). The pair of equations which does not represent a straight line is:

Answer»

`ax-by+cz+d=0,ax+b'y+cz+d=0(bneb')`
`ax-by+cz+d=0,ax+by+C'z+d=0(CNEC')`
`ax+by+cz+d=0,ax+by+cz-d'=0(DNED')`
`ax+by+cz+d=0,a'x+by+cz-d=0(ANEA')`

ANSWER :C


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