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Which condition is correct for the equations (17x+py=51) and (8x+3y=25) to have a unique solution?

Answer and explanation

Correct answer: \(p\ne\frac{51}{8}\)

Two linear equations have a unique solution when \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\). Here, \(\frac{17}{8}\ne\frac{p}{3}\) is required. Cross-multiplication gives \(51\ne8p\), or \(p\ne\frac{51}{8}\). Hence, option B is correct. Exam tip: For a unique solution, the ratios of corresponding coefficients must be unequal; in option A, the ratios become equal, so the equations do not have a unique solution.

Related tags

Pair Of Linear EquationsConditions For SolvabilityUnique SolutionParameterPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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