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If (x − 1)/2 + (y + 1)/3 = 8 and (x − 1)/3 − (y + 1)/2 = −1, what is the value of x?

Answer and explanation

Correct answer: 145/13

Introduce u = x - 1 and v = y + 1 to remove the repeated shifts. Multiplying the first equation by 6 gives 3u + 2v = 48, while multiplying the second by 6 gives 2u - 3v = -6. To eliminate v, multiply these equations by 3 and 2 respectively: 9u + 6v = 144 and 4u - 6v = -12. Addition gives 13u = 132, so u = 132/13. Since u = x - 1, x = u + 1 = 132/13 + 13/13 = 145/13. Therefore option A is correct. The values 11, 12, and 13 would incorrectly treat the transformed variable u as x or would ignore the fractional solution; direct substitution confirms the fractional answer.

Related tags

Linear-EquationsFractional-EquationsElimination-MethodAlgebraic 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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