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When will ((p-2)x+9y=4) and (5x+15y=12) have a unique solution?

Answer and explanation

Correct answer: \(p\neq 5\)

Two linear equations \(a_1x+b_1y=c_1\) and \(a_2x+b_2y=c_2\) have a unique solution when \(\frac{a_1}{a_2}\neq\frac{b_1}{b_2}\). Here, we need \(\frac{p-2}{5}\neq\frac{9}{15}=\frac{3}{5}\). The ratios become equal only when \(p-2=3\), i.e. \(p=5\). Therefore, the pair has a unique solution for \(p\neq 5\). At \(p=2\), the ratios are still unequal, so it does not prevent a unique solution. Exam tip: compare the ratios of the coefficients of \(x\) and \(y\) first.

Related tags

Class 10 MathematicsPair Of Linear EquationsUnique SolutionConsistency ConditionsCoefficient RatiosConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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