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If a₁ = 6, b₁ = 9, c₁ = 12 and a₂ = 2, b₂ = 3, c₂ = 4, how will the lines be?

Answer and explanation

Correct answer: Coincident

Use the consistency criterion for two linear equations. Compute each ratio: a₁/a₂ = 6/2 = 3, b₁/b₂ = 9/3 = 3, and c₁/c₂ = 12/4 = 3. Since all three ratios are equal, the second equation is obtained by multiplying the first equation by 1/3. Thus both equations represent the same geometric line. The lines are coincident and the system has infinitely many solutions, so option B is correct. Distinct parallel lines would require the first two ratios to be equal but different from the constant-term ratio. Intersecting lines would require unequal ratios for the coefficients, and perpendicularity is not established by this test.

Related tags

Pair-Of-Linear-EquationsCoincident-LinesRatio-TestConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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