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Which condition is correct for (9x+py=27) and (3x+5y=11) to have a unique solution?

Answer and explanation

Correct answer: \(p\ne15\)

Two linear equations have a unique solution when \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\). Here, \(\frac{9}{3}=3\) and the second ratio is \(\frac{p}{5}\). Thus, \(3\ne\frac{p}{5}\), which gives \(p\ne15\). Therefore, option B is correct. If \(p=15\), the coefficient ratios become equal, so the equations cannot have a unique solution. Exam tip: For a unique solution, compare the ratios of the coefficients of \(x\) and \(y\).

Related tags

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

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