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For infinitely many solutions of 5x + (r + 1)y = 11 and 15x + 18y = 33, what is r?

Answer and explanation

Correct answer: r = 5

For infinitely many solutions, the two equations must represent the same line. Therefore, the ratios of corresponding coefficients and constants must be equal. Here, 5/15 = 1/3 and 11/33 = 1/3. The remaining ratio must satisfy (r + 1)/18 = 1/3. Multiplying both sides by 18 gives r + 1 = 6, so r = 5. Substituting r = 5 makes the first equation 5x + 6y = 11, while multiplying it by 3 gives 15x + 18y = 33, exactly the second equation. Thus the equations are coincident and have infinitely many common solutions. Option B is correct. Every other listed value breaks the proportionality condition and cannot produce infinitely many solutions.

Related tags

Linear EquationsInfinitely Many SolutionsParameterConditions For SolvabilityClass 10 MathematicsPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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