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If a₁ = 5, b₁ = 10, c₁ = 15 and a₂ = 1, b₂ = 2, c₂ = 3, how will the lines be?

Answer and explanation

Correct answer: Coincident

For the pair a₁x + b₁y + c₁ = 0 and a₂x + b₂y + c₂ = 0, the graphical classification depends on the ratios of corresponding coefficients. Here, a₁/a₂ = 5/1 = 5, b₁/b₂ = 10/2 = 5, and c₁/c₂ = 15/3 = 5. Since all three ratios are equal, the two equations are scalar multiples of one another: the first equation is five times the second. Multiplying an equation by a nonzero constant does not change its graph, so both equations represent exactly the same line. Hence every point on that line is a common solution, giving infinitely many solutions. Distinct parallel lines would have only the first two ratios equal, not all three.

Related tags

Pair-Of-Linear-EquationsCoincident-LinesRatio-TestInfinite-SolutionsGraphical Method Of Finding Solutions.Graphical Method Of Finding SolutionsPair Of Linear Equations In Two VariablesMathematics

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