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What is the value of (q) for the equations (9x+qy=36) and (18x+14y=72) to have infinitely many solutions?

Answer and explanation

Correct answer: 7

A pair of linear equations has infinitely many solutions when the ratios of the corresponding coefficients and constant terms are equal. Here, the second equation must be twice the first: 18x = 2(9x) and 72 = 2(36). Therefore, 14 = 2q, giving q = 7. Hence, option C is correct. Exam tip: For infinitely many solutions, check the condition a₁/a₂ = b₁/b₂ = c₁/c₂.

Related tags

Linear EquationsInfinitely Many SolutionsDependent EquationsParameter ValueClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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