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What should (s) be for the equations (7x+13y=67) and (21x+39y=s) to be consistent and dependent?

Answer and explanation

Correct answer: 201

For a pair of linear equations to be consistent and dependent, the corresponding coefficients and constant terms must be in the same ratio. Here, the coefficients in the second equation are three times those in the first: 21=3×7 and 39=3×13. Therefore, its constant term must also be three times 67, so s=3×67=201. Hence, option C is correct. Exam tip: First identify the common multiplier between the corresponding x- and y-coefficients, then apply it to the constant term.

Related tags

Linear EquationsConditions For SolvabilityConsistent Dependent EquationsParameterGrade 10 MathematicsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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