In the general equation of a line, A and B must not both be:
AZero together
BZero halved
CZero doubled
DZero squared
Answer & Solution
Correct answer: A. Zero together
1. If both coefficients vanished, no x or y would remain.
2. The equation would then describe no line at all.
3. A and B are required not to be zero simultaneously.
4. So at least one of them must be non-zero.
_Source: NCERT Class XI Mathematics, Ch 9 'Straight Lines'_
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