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Which conclusion is correct by observing (4x+8y=12) and (x+2y=5)?

Answer and explanation

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

Here, \(a_1/a_2=4/1=4\) and \(b_1/b_2=8/2=4\), but \(c_1/c_2=12/5\). Thus, \(a_1/a_2=b_1/b_2\ne c_1/c_2\), which is the condition for an inconsistent pair of linear equations. In fact, the first equation simplifies to \(x+2y=3\), while the second is \(x+2y=5\); therefore, the lines are parallel and there is no solution. Exam tip: In the ratio test, always compare the constant-term ratio as well.

Related tags

Pair Of Linear EquationsSolvability ConditionsInconsistent EquationsParallel LinesConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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