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What is the value of a for the equations ax + 4y = 10 and 3x + 6y = 15 to have infinitely many solutions?

Answer and explanation

Correct answer: a = 2

For a pair of linear equations a₁x + b₁y + c₁ = 0 and a₂x + b₂y + c₂ = 0 to have infinitely many solutions, the three ratios a₁/a₂, b₁/b₂, and c₁/c₂ must be equal. Rewrite the equations as ax + 4y − 10 = 0 and 3x + 6y − 15 = 0. Since 4/6 = 10/15 = 2/3, we require a/3 = 2/3. Therefore a = 2, so option B is correct. This makes the first equation exactly two-thirds of the second: 2x + 4y − 10 = 0 after scaling, while the second is 3x + 6y − 15 = 0. Options A, C, and D fail the proportionality condition and would produce a unique or inconsistent relationship rather than infinitely many solutions.

Related tags

Linear-EquationsInfinite-SolutionsProportionalityClass-10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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