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If the equations for two numbers are (x+y=12) and (2x-y=3), what will be the solution status?

Answer and explanation

Correct answer: One unique solution

For the first equation, \(a_1=1, b_1=1\), and for the second equation, \(a_2=2, b_2=-1\). Here, \(\frac{a_1}{a_2}=\frac{1}{2}\) and \(\frac{b_1}{b_2}=-1\), so the two ratios are unequal. Therefore, the corresponding lines intersect at exactly one point, giving one unique solution. Option B would apply if the relevant ratios were equal and the lines were parallel. Exam tip: if \(\frac{a_1}{a_2}\ne\frac{b_1}{b_2}\), a pair of linear equations has a unique solution.

Related tags

Linear EquationsSolvability ConditionsUnique SolutionPair Of LinesConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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