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When will (mx+7y=13) and (16x+14y=26) have a unique solution?

Answer and explanation

Correct answer: \(m\neq 8\)

A pair of linear equations has a unique solution when \(\frac{a_1}{a_2}\neq\frac{b_1}{b_2}\). Here, \(\frac{m}{16}\neq\frac{7}{14}=\frac12\) is required. Therefore, the pair has a unique solution for \(m\neq8\). If \(m=8\), then \(\frac{m}{16}=\frac{7}{14}=\frac{13}{26}=\frac12\), so both equations represent the same line and have infinitely many solutions. Exam tip: for a unique solution, the ratios of the corresponding coefficients must be unequal.

Related tags

Class 10 MathematicsPair Of Linear EquationsUnique SolutionConsistency ConditionsCoefficient RatiosConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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