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If 6x − 2y = 18 and 3x − y = t are inconsistent, what is the correct condition for t?

Answer and explanation

Correct answer: t ≠ 9

For two linear equations a₁x + b₁y + c₁ = 0 and a₂x + b₂y + c₂ = 0, the pair is inconsistent when a₁/a₂ = b₁/b₂ but c₁/c₂ is different. Here, compare 6x − 2y = 18 with 3x − y = t. The x-coefficient ratio is 6/3 = 2, and the y-coefficient ratio is (−2)/(−1) = 2. Therefore, the equations have the same direction. For them to be inconsistent, they must represent distinct parallel lines, so 18/t must not equal 2. Equality would give t = 9, making the second equation exactly half of the first and producing infinitely many solutions. Hence t ≠ 9, so option B is correct.

Related tags

Linear EquationsInconsistent EquationsConditions For SolvabilityParameterClass 10 MathematicsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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