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In which condition is a pair of two linear equations called consistent and dependent?

Answer and explanation

Correct answer: When (a₁/a₂=b₁/b₂=c₁/c₂)

For the pair a₁x+b₁y+c₁=0 and a₂x+b₂y+c₂=0, the condition a₁/a₂=b₁/b₂=c₁/c₂ means that every coefficient, including the constant term, is in the same proportion. Consequently, one equation is a non-zero scalar multiple of the other, so both equations represent the same line. The two lines have infinitely many common points, making the pair consistent; because the equations describe the same line and one depends on the other, it is dependent. If only the first two ratios are equal but the constant ratio differs, the lines are distinct parallel and inconsistent. Unequal first two ratios give one intersection. Thus A is correct.

Related tags

Linear EquationsRatio ConditionConsistent DependentConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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