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Which condition is correct for the equations (8x+py=40) and (2x+3y=11) to have a unique solution?

Answer and explanation

Correct answer: \(p \ne 12\)

Two linear equations have a unique solution when \(\frac{a_1}{a_2} \ne \frac{b_1}{b_2}\). Here, \(\frac{8}{2} \ne \frac{p}{3}\), which gives \(4 \ne \frac{p}{3}\), so \(p \ne 12\). If \(p=12\), the ratios of the coefficients become equal, but the ratio of the constant terms does not; hence the equations have no solution rather than a unique solution. In an exam, compare the coefficient ratios first to identify the condition for a unique solution.

Related tags

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

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