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When will (11x+3y=4) and (22x+sy=10) have a unique solution?

Answer and explanation

Correct answer: \(s\neq6\)

A pair of linear equations has a unique solution when the ratios of corresponding coefficients are unequal: \(\frac{a_1}{a_2}\neq\frac{b_1}{b_2}\). Here, \(\frac{11}{22}=\frac12\), which equals \(\frac{3}{s}\) only when \(s=6\). Therefore, the pair has a unique solution for \(s\neq6\). At \(s=6\), the lines are parallel because the constant-term ratio \(\frac{4}{10}\) is not \(\frac12\). Exam tip: use the determinant condition \(11s-22\times3\neq0\) for a quick check.

Related tags

Class 10MathematicsLinear EquationsUnique SolutionSolvabilityDeterminantConditions For SolvabilityPair Of Linear Equations In Two Variables

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