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Which condition is correct for the equations (11x+ky=70) and (5x+4y=31) to have a unique solution?

Answer and explanation

Correct answer: \(k\ne\frac{44}{5}\)

Two linear equations have a unique solution when the ratios of the coefficients of the variables are unequal. Here, the required condition is \(\frac{11}{5}\ne\frac{k}{4}\). On simplifying, this gives \(44\ne5k\), or \(k\ne\frac{44}{5}\). Therefore, option B is correct. Exam tip: for a unique solution, use \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\). In option A, the two ratios become equal, so it does not represent a unique solution.

Related tags

Linear EquationsUnique SolutionSolvability ConditionsParameterGrade 10Conditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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