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Which statement is correct about 3x+4y=10 and 6x+8y=21?

Answer and explanation

Correct answer: There is no solution

Use the consistency test for two linear equations. Multiplying 3x+4y=10 by 2 gives 6x+8y=20, whereas the second equation states 6x+8y=21. Since identical left-hand sides cannot have two different right-hand values, no ordered pair can satisfy both equations. Equivalently, the coefficient ratios are equal, 3/6=4/8, but the constant ratio 10/21 is different; this represents two distinct parallel lines. Hence option A, no solution, is correct. Option B would be true only if the second equation were 6x+8y=20. Option C is impossible for parallel distinct lines, and substituting x=2,y=1 gives 10 in the first equation but 20, not 21, in the second.

Related tags

Linear EquationsConsistencyParallel LinesNo SolutionAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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