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What will (k) be for the equations (kx+12y=36) and (15x+20y=60) to have infinitely many solutions?

Answer and explanation

Correct answer: 9

A pair of linear equations has infinitely many solutions when the ratios of corresponding coefficients and constants are equal: k/15 = 12/20 = 36/60. Since both 12/20 and 36/60 equal 3/5, we get k/15 = 3/5, so k = 9. Therefore, option C is correct. Exam tip: For infinitely many solutions, verify a₁/a₂ = b₁/b₂ = c₁/c₂.

Related tags

Linear EquationsSolvability ConditionsParameterInfinite SolutionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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