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If a₁/a₂ = b₁/b₂ = c₁/c₂, how many solutions will the pair of linear equations have?

Answer and explanation

Correct answer: Infinitely many solutions

For the pair a₁x + b₁y + c₁ = 0 and a₂x + b₂y + c₂ = 0, the condition a₁/a₂ = b₁/b₂ = c₁/c₂ means that all corresponding coefficients have the same ratio. Consequently, one equation is a constant multiple of the other, so both equations represent the same coincident line. Every point on this common line satisfies both equations, and therefore the system has infinitely many solutions. This is the dependent and consistent case. A unique solution occurs when a₁/a₂ is not equal to b₁/b₂, corresponding to intersecting lines. No solution occurs when a₁/a₂ = b₁/b₂ but this common ratio differs from c₁/c₂, corresponding to distinct parallel lines. Hence option C is unambiguous.

Related tags

Conditions-Of-SolvabilityCoincident-LinesInfinitely-Many-SolutionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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