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When will qx + 4y = 9 and 15x + 10y = 18 have a unique solution?

Answer and explanation

Correct answer: q ≠ 6

A pair of linear equations a1x + b1y = c1 and a2x + b2y = c2 has a unique solution when a1/a2 is not equal to b1/b2. This means the two lines have different slopes and intersect at exactly one point. For the given equations, q/15 must not equal 4/10, which simplifies to 2/5. Therefore q/15 ≠ 2/5, so q ≠ 15 × 2/5 = 6. Hence option A is correct. If q = 6, the coefficient ratios become equal; depending on the constants, the pair would then be either parallel distinct or coincident, but it would not satisfy the unique-solution condition. The values 15 and the equality q = 15 are irrelevant to the required ratio.

Related tags

Class10Linear-EquationsUnique-SolutionConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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