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If (7x+4y=37) and (21x+12y=n) have infinitely many solutions then what is (n)?

Answer and explanation

Correct answer: 111

For two linear equations to have infinitely many solutions, the ratios of the corresponding coefficients and constant terms must be equal. Here, the coefficients of x and y in the second equation are three times those in the first: 21=3×7 and 12=3×4. Therefore, the constant term must also be three times 37, so n=3×37=111. Hence, option C is correct. Exam tip: Infinitely many solutions mean that both equations represent the same line.

Related tags

Linear EquationsConditions For SolvabilityInfinite SolutionsParameter ValuePair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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