If a pair of linear equations is consistent, then the lines will be


Condition for a consistent pair of linear equations -

Consistent equations means the equations must have solution so lines may either coincide(with infinitely many solutions) or with a unique solution {lines must not be parallel}.


1) Must not be parallel so,


a1/a2 b1/b2 [intersecting lines with unique solution]


2) Also the lines can coincide, so,


a1/a2 = b1/b2 = c1/c2 [coincident or dependent]

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