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When will (rx+2y=5) and (9x+3y=8) have a unique solution?

Answer and explanation

Correct answer: \(r\neq6\)

Two linear equations \(a_1x+b_1y=c_1\) and \(a_2x+b_2y=c_2\) have a unique solution when \(\frac{a_1}{a_2}\neq\frac{b_1}{b_2}\). Here, \(\frac{r}{9}\neq\frac{2}{3}\) is required. Since \(\frac{2}{3}=\frac{6}{9}\), we get \(r\neq6\). If \(r=6\), the coefficients on the left-hand sides become proportional, so the solution cannot be unique. Exam tip: compare the ratios of the coefficients of \(x\) and \(y\) first.

Related tags

Class 10 MathematicsPair Of Linear EquationsUnique SolutionConditions For SolvabilityCoefficient RatiosPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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