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How many solutions are there for (2x + 5y = 20) and (4x + 10y = 40)?

Answer and explanation

Correct answer: Infinitely many solutions

To determine the number of solutions, compare the two equations. Multiplying every term of 2x + 5y = 20 by 2 gives 4x + 10y = 40, which is exactly the second equation. Thus both equations represent the same line, not two distinct lines. Every point on that line satisfies both equations, so the pair has infinitely many solutions and option C is correct. In coefficient form, a₁/a₂ = 2/4 = 1/2, b₁/b₂ = 5/10 = 1/2, and c₁/c₂ = 20/40 = 1/2; equality of all three ratios confirms coincident lines. No solution would correspond to distinct parallel lines, while exactly one solution would require intersecting lines. Two solutions cannot occur for two distinct linear equations in this setting.

Related tags

Coincident-LinesInfinite-SolutionsRatio-ConditionConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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