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What is the value of (b) for the equations (3x+by=24) and (12x+20y=96) to have infinitely many solutions?

Answer and explanation

Correct answer: 5

A pair of linear equations has infinitely many solutions when a₁/a₂ = b₁/b₂ = c₁/c₂. Here, 3/12 = 24/96 = 1/4. Therefore, b/20 = 1/4, which gives b = 5. Hence, option C is correct. Exam tip: all three coefficient-to-constant ratios must be equal; checking only one ratio is insufficient.

Related tags

Linear EquationsInfinitely Many SolutionsSolvability ConditionsParameterDependent EquationsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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