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If a₁ = 7, b₁ = 14, c₁ = 21 and a₂ = 1, b₂ = 2, c₂ = 3, how will the lines be?

Answer and explanation

Correct answer: Coincident

The governing concept is the coefficient-ratio test for the pair of linear equations a₁x + b₁y + c₁ = 0 and a₂x + b₂y + c₂ = 0. Compute the three ratios: a₁/a₂ = 7/1 = 7, b₁/b₂ = 14/2 = 7, and c₁/c₂ = 21/3 = 7. Since all three ratios are equal, the second equation is obtained by multiplying the first equation by 1/7, or equivalently both equations represent the same geometric line. Hence the lines are coincident and the system has infinitely many solutions. Parallel distinct lines would require the coefficient ratios for a and b to be equal but the constant ratio to be different. Intersecting lines would have unequal ratios for a and b, while perpendicularity is not established by this test. Therefore option B is correct.

Related tags

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

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