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Which option is correct for (x+3y=7) and (2x+5y=9)?

Answer and explanation

Correct answer: One unique solution

For the first equation, a₁=1 and b₁=3, while for the second equation, a₂=2 and b₂=5. Here, \(a₁/a₂=1/2\) and \(b₁/b₂=3/5\), so the ratios are unequal. Therefore, the two lines intersect at one point and the pair has a unique solution. In fact, the solution is \(x=-8, y=5\). Exam tip: If \(a₁/a₂ \ne b₁/b₂\), a pair of linear equations has a unique solution.

Related tags

Linear EquationsUnique SolutionIntersecting LinesSolvability ConditionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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