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If (11x+7y=59) and (33x+21y=n) have infinitely many solutions, what is (n)?

Answer and explanation

Correct answer: 177

For two linear equations to have infinitely many solutions, all corresponding coefficients and constants must be proportional. Here, the coefficients of x and y in the second equation are three times those in the first: 33=3×11 and 21=3×7. Therefore, the constant term must also be three times 59, so n=3×59=177. Hence, option C is correct. Exam tip: infinitely many solutions require
\(\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}\).

Related tags

Linear EquationsSolvability ConditionsInfinite SolutionsParameterConditions For SolvabilityPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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