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What will be the value of (m) for (2x+my=14) and (8x+20y=56) to have infinitely many solutions?

Answer and explanation

Correct answer: 5

For two linear equations to have infinitely many solutions, the ratios a₁/a₂, b₁/b₂ and c₁/c₂ must be equal. Here, 2/8 = 14/56 = 1/4, so m/20 must also equal 1/4. Therefore, m = 5, making option A correct. For example, if m = 6, then m/20 = 3/10, which is not equal to 1/4. Exam tip: For infinitely many solutions, always check that all three coefficient and constant ratios are equal.

Related tags

Linear EquationsParameterInfinite SolutionsSolvability ConditionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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