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If 4x − y = 13 and x − y = 1, what is the value of x?

Answer and explanation

Correct answer: x = 4

The governing concept is elimination by subtracting equations with identical y terms. Since both equations contain −y, subtract the second from the first: (4x − y) − (x − y) = 13 − 1. Distributing the minus sign gives 4x − y − x + y = 12, so the y terms cancel and 3x = 12. Dividing by 3 gives x = 4, hence option C is correct. Verification is important: from x − y = 1 and x = 4, we obtain 4 − y = 1, so y = 3. Substitution in the first equation gives 4(4) − 3 = 16 − 3 = 13. Therefore the pair satisfies both equations. The other proposed x-values cannot produce one common y for both equations.

Related tags

Linear-EquationsElimination-MethodSubtractionSimultaneous-EquationsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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