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If 8x − 4y = 24 and 2x − y = t are inconsistent, what is the correct condition for t?

Answer and explanation

Correct answer: t ≠ 6

The standard condition for an inconsistent pair is a₁/a₂ = b₁/b₂ but c₁/c₂ unequal to that common ratio. For 8x − 4y = 24 and 2x − y = t, the x-coefficient ratio is 8/2 = 4 and the y-coefficient ratio is (−4)/(−1) = 4. Thus the two lines are parallel or coincident. Coincidence occurs when 24/t = 4, which gives t = 6. In that case, the second equation is one-fourth of the first and there are infinitely many solutions. To obtain distinct parallel lines and therefore inconsistency, t must not be 6. Hence option B is correct; the other listed values do not state the required exclusion condition.

Related tags

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

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