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When will the pair (kx+5y=10) and (6x+15y=18) have a unique solution?

Answer and explanation

Correct answer: \(k\neq2\)

A pair of linear equations \(a_1x+b_1y=c_1\) and \(a_2x+b_2y=c_2\) has a unique solution when \(\frac{a_1}{a_2}\neq\frac{b_1}{b_2}\). Here, \(\frac{k}{6}\neq\frac{5}{15}=\frac{1}{3}\), which gives \(k\neq2\). At \(k=2\), the ratios of the coefficients on the left-hand sides are equal, so the solution cannot be unique. Exam tip: for a unique solution, compare the ratios of the coefficients of \(x\) and \(y\).

Related tags

Class 10 MathematicsPair Of Linear EquationsUnique SolutionConditions For SolvabilityCoefficient RatiosPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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