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Which condition is correct for (8x+py=24) and (2x+3y=7) to have a unique solution?

Answer and explanation

Correct answer: \(p\ne12\)

A pair of linear equations has a unique solution when \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\). Here, \(\frac{8}{2}=4\) and \(\frac{p}{3}\), so the condition is \(4\ne\frac{p}{3}\), which gives \(p\ne12\). Therefore, option B is correct. Notice that when \(p=12\), the coefficient ratios become equal, but the constant ratio \(\frac{24}{7}\) is different; hence the equations have no solution rather than a unique solution. Exam tip: compare the ratios of the coefficients first to test for a unique solution.

Related tags

Linear EquationsUnique SolutionSolvability ConditionsParameterConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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