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If (8x+5y=43) and (24x+15y=n) have infinitely many solutions, what is (n)?

Answer and explanation

Correct answer: 129

For two linear equations to have infinitely many solutions, one equation must be an exact multiple of the other. Here, 24=3×8 and 15=3×5, so the right-hand side must also be three times 43. Hence, n=3×43=129, making option C correct. Exam tip: For infinitely many solutions, check that the ratios of all corresponding coefficients and constants are equal.

Related tags

Linear EquationsSolvability ConditionsParameterInfinite SolutionsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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