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What is the value of q for infinitely many solutions of qx + 11y = 22 and 18x + 33y = 66?

Answer and explanation

Correct answer: q = 6

For infinitely many solutions, the two equations must be proportional and therefore represent the same line. Comparing corresponding coefficients and constants gives q/18 = 11/33 = 22/66. The known ratios are 11/33 = 1/3 and 22/66 = 1/3. Hence q/18 must also equal 1/3. Multiplying by 18 gives q = 6. Substitution verifies the result: qx + 11y = 22 becomes 6x + 11y = 22, while multiplying this equation by 3 gives 18x + 33y = 66, exactly the second equation. Thus the equations are coincident and have infinitely many common solutions. Option C is correct. Values 4, 5, and 7 do not preserve proportionality.

Related tags

Class10Linear-EquationsInfinite-SolutionsCoincident-LinesConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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