A) \[a=c=0,\,\,b\ne 0\]
B) \[b=c=0,\,\,a\ne 0\]
D) \[a=b\ne 0\]
Correct Answer: C
Solution :\[ax+by+c=0\] When a and b are equal to zero, then the above linear equation does not represent an equation of line.
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