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In 13x - 6y = 8 and 13x + 4y = 48, what is the value of y?

Answer and explanation

Correct answer: 4

The governing idea is elimination using equal coefficients of x. Both equations contain 13x, so subtract the first equation from the second: (13x + 4y) - (13x - 6y) = 48 - 8. The x-terms cancel, and carefully combining the y-terms gives 4y + 6y = 10y. Thus 10y = 40 and y = 4. A consistency check is useful: with y=4, the first equation gives 13x - 24 = 8, so 13x = 32; the second gives 13x + 16 = 48, also yielding 13x = 32. Therefore option C is correct. Values 2, 3, and 5 may result from subtracting the y-coefficients incorrectly or dividing 40 by the wrong number.

Related tags

Pair-Of-Linear-EquationsEliminationSame-CoefficientSubtraction-MethodMathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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