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What should (s) be for the equations (4x+5y=29) and (8x+10y=s) to be consistent and dependent?

Answer and explanation

Correct answer: 58

For a pair of consistent and dependent linear equations, the ratios of the corresponding coefficients and constant terms must be equal. Here, \(\frac{4}{8}=\frac{5}{10}=\frac{1}{2}\), so \(\frac{29}{s}=\frac{1}{2}\). Therefore, \(s=58\). The nearby value 57 is incorrect because it does not preserve the same ratio for the constant terms. Exam tip: when one equation is multiplied by \(k\), its constant term must also be multiplied by \(k\).

Related tags

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

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