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Which condition is correct for (11x+py=33) and (4x+2y=15) to have a unique solution?

Answer and explanation

Correct answer: \(p\ne\frac{11}{2}\)

For two linear equations to have a unique solution, the ratios of the coefficients of the two variables must be unequal: \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\). Here, \(\frac{a_1}{a_2}=\frac{11}{4}\) and \(\frac{b_1}{b_2}=\frac{p}{2}\). Thus, \(\frac{11}{4}\ne\frac{p}{2}\), which gives \(p\ne\frac{11}{2}\). Therefore, option B is correct. In option A, the two ratios become equal, so the system cannot have a unique solution. Exam tip: For a unique solution, check that the ratios of the corresponding variable coefficients are unequal.

Related tags

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

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