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In 13x−6y=1 and 13x+9y=61, what is the value of y?

Answer and explanation

Correct answer: 4

The governing method is elimination. Both equations have the same coefficient, 13, for x, so subtract the first equation from the second to cancel x: (13x + 9y) − (13x − 6y) = 61 − 1. The x terms disappear and the y terms give 15y = 60. Dividing both sides by 15 yields y = 4, so option C is correct. For verification, place y = 4 in the first equation: 13x − 24 = 1, hence 13x = 25 and x = 25/13. In the second equation, 13(25/13) + 9(4) = 25 + 36 = 61, so the pair is consistent. The other choices would make the difference of the two left sides 30, 45, or 75 instead of 60.

Related tags

Pair-Linear-EquationsElimination-MethodVariable-CancellationAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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