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If 6a + 5b = 460 and 4a + 7b = 444, what is the value of b?

Answer and explanation

Correct answer: 412/11

Eliminate a by making its coefficients equal. Multiply 6a + 5b = 460 by 2 to obtain 12a + 10b = 920, and multiply 4a + 7b = 444 by 3 to obtain 12a + 21b = 1332. Subtract the first new equation from the second: (12a + 21b) − (12a + 10b) = 1332 − 920. Hence 11b = 412 and b = 412/11. Therefore option C is correct. The coefficient of a cancels exactly, which is the governing idea of the elimination method. The nearby choices differ by 10 in the numerator and would arise from an arithmetic error in the subtraction; substituting b = 412/11 with the corresponding a confirms the system.

Related tags

Pair-Of-Linear-EquationsEliminationCoefficient-MatchingFraction-ValueAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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