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What conclusion follows from comparing the ratios of a and b in 6x + 17y = 71 and 11x + 31y = 130?

Answer and explanation

Correct answer: 6/11 ≠ 17/31, so there is one unique solution

Compare the ratios of the corresponding x- and y-coefficients in the equations 6x + 17y = 71 and 11x + 31y = 130. The ratios are 6/11 and 17/31. They are unequal, since 6 × 31 = 186 whereas 17 × 11 = 187. Therefore the two equations represent lines with different slopes. Two lines with different slopes intersect at one and only one point, so the pair is consistent and independent and has a unique solution. It is not necessary to compare the constant ratio after finding the first two ratios unequal. If the first two ratios were equal but the constant ratio differed, the pair would be inconsistent; if all three were equal, it would have infinitely many solutions. Hence option C is correct.

Related tags

Linear EquationsRatio ComparisonUnique SolutionConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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