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What is the number of solutions of 4x+7y=31 and 8x+14y=62?

Answer and explanation

Correct answer: Infinitely many solutions

Multiply the first equation by 2: 2(4x+7y=31) gives 8x+14y=62, exactly the second equation. Hence the two equations are dependent and represent the same straight line. Since every point on that line satisfies both equations, the pair has infinitely many ordered-pair solutions. Therefore option D is correct, not a unique or inconsistent solution.

Related tags

Linear EquationsDependent EquationsInfinite SolutionsClass 10Conditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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