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Which condition is correct for (3x+qy=11) and (7x+14y=26) to have a unique solution?

Answer and explanation

Correct answer: \(q\ne 6\)

For two linear equations to have a unique solution, the ratios of the corresponding coefficients must be unequal. Thus, \(\frac{3}{7}\ne\frac{q}{14}\). On cross-multiplying, this gives \(42\ne 7q\), or \(q\ne 6\). If \(q=6\), the ratios of the coefficients of \(x\) and \(y\) become equal, so the system does not have a unique solution. Exam tip: For a unique solution, remember \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\).

Related tags

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

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