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Which condition is correct for (6x+ky=24) and (3x+5y=17) to have a unique solution?

Answer and explanation

Correct answer: \(k\ne 10\)

Two linear equations \(a_1x+b_1y=c_1\) and \(a_2x+b_2y=c_2\) have a unique solution when \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\). Here, \(\frac{6}{3}=2\) and the other coefficient ratio is \(\frac{k}{5}\). Thus, for a unique solution, \(2\ne\frac{k}{5}\), which gives \(k\ne10\). If \(k=10\), the coefficient ratios are equal, but \(\frac{24}{17}\ne2\), so the equations have no solution. Exam tip: compare the ratios of the coefficients of \(x\) and \(y\) first.

Related tags

Pair Of Linear EquationsUnique SolutionConditions For SolvabilityParameterCoefficient RatiosPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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