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What kind of pair is (5x-y=9) and (10x-2y=18)?

Answer and explanation

Correct answer: Consistent and dependent

Compare the two equations directly. Multiplying every term of 5x-y=9 by 2 gives 10x-2y=18, which is exactly the second equation. Thus both equations represent the same straight line rather than two different lines. Every point on this common line satisfies both equations, so there are infinitely many common solutions. Such a pair is called consistent and dependent: it is consistent because solutions exist, and dependent because one equation is a scalar multiple of the other. Option A would require one intersection, option B would indicate parallel distinct lines, and option D is not the relevant classification.

Related tags

Linear EquationsCoincident LinesConsistent DependentConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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