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From 5x − y = 25 and x + y = 11, what is the value of x?

Answer and explanation

Correct answer: x = 6

The governing concept is elimination. The coefficients of y are −1 and +1, so adding the two equations cancels y immediately: (5x − y) + (x + y) = 25 + 11. This simplifies to 6x = 36. Dividing both sides by 6 gives x = 6, so option C is correct. To verify, substitute x = 6 into x + y = 11; this gives y = 5. The first equation then becomes 5(6) − 5 = 30 − 5 = 25, which is true. Thus the pair is (6,5). Values 4, 5, and 7 would lead to inconsistent y-values or fail the sum obtained after elimination, so they cannot be solutions of the given pair.

Related tags

Linear EquationsElimination MethodValue Of XClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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