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When will the pair ((p+2)x+5y=11) and (6x+10y=13) have a unique solution?

Answer and explanation

Correct answer: For every real \(p\) except \(p=1\)

A pair of linear equations has a unique solution when \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\). Here, we need \(\frac{p+2}{6}\ne\frac{5}{10}\). Since \(\frac{5}{10}=\frac12\), this gives \(\frac{p+2}{6}\ne\frac12\), so \(p+2\ne3\), or \(p\ne1\). At \(p=1\), the ratios of the coefficients of \(x\) and \(y\) are equal, but the constant ratio \(\frac{11}{13}\) is different; hence there is no solution then. Exam tip: For a unique solution, first compare the ratios of the coefficients of \(x\) and \(y\).

Related tags

Class 10 MathematicsPair Of Linear EquationsUnique SolutionSolvability ConditionsParameter PConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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