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What is the condition for a unique solution of (ax+by=1) and (2ax+3by=5)?

Answer and explanation

Correct answer: \(ab\neq 0\)

The determinant of the coefficient matrix is \(D=a(3b)-(2a)b=ab\). A pair of linear equations has a unique solution only when \(D\neq 0\). Hence, the required condition is \(ab\neq 0\), meaning that neither \(a\) nor \(b\) can be zero. Conditions such as \(a+b=0\) or \(a=b\) do not by themselves guarantee a unique solution. Exam tip: for a unique solution, check whether \(a_1b_2-a_2b_1\neq0\).

Related tags

Class 10 MathematicsPair Of Linear EquationsUnique SolutionDeterminantSolvability ConditionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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