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If (9x+5y=47) and (27x+15y=n) have infinitely many solutions, what is (n)?

Answer and explanation

Correct answer: 141

For two linear equations to have infinitely many solutions, the ratios of their corresponding coefficients and constants must be equal. Here, \(27/9=3\) and \(15/5=3\), so the second equation must be 3 times the first one. Hence, \(n=3\times47=141\), making option C correct. Exam tip: For infinitely many solutions, check \(a_1/a_2=b_1/b_2=c_1/c_2\).

Related tags

Linear EquationsSolvability ConditionsInfinite SolutionsParameterClass 10 MathematicsConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematics

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