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Which conclusion is correct by observing the equations (15x+20y=55) and (3x+4y=12)?

Answer and explanation

Correct answer: The first two ratios are equal, but the ratio of the constant terms is different

The ratios of the corresponding coefficients are 15/3 = 5 and 20/4 = 5, whereas the ratio of the constant terms is 55/12, which is not 5. Thus, a₁/a₂ = b₁/b₂ ≠ c₁/c₂, so the lines are distinct and parallel and the pair has no solution. Option A is incorrect because all three ratios are not equal. Exam tip: When a₁/a₂ = b₁/b₂ ≠ c₁/c₂, a pair of linear equations has no solution.

Related tags

Pair Of Linear EquationsSolvability ConditionsNo SolutionParallel LinesClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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