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Choose the correct statement for (7x+4y=20) and (14x+8y=40).

Answer and explanation

Correct answer: There are infinitely many solutions

Multiply the first equation, 7x+4y=20, by 2. The result is 14x+8y=40, exactly the second equation. Hence both equations have the same set of solutions and their graphs are coincident, not merely parallel. Every point on this common line satisfies both equations, so the pair has infinitely many solutions. In the ratio test, a₁/a₂=7/14=1/2, b₁/b₂=4/8=1/2, and c₁/c₂=20/40=1/2; equality of all three ratios confirms a consistent and dependent pair. Therefore option C is correct; a unique solution would require unequal coefficient ratios.

Related tags

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

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