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Find the value of x from the equations 5x − y = 9 and 2x − y = 3.

Answer and explanation

Correct answer: x = 2

The governing concept is the elimination method for a pair of linear equations in two variables. The coefficient of y is −1 in both equations, so subtracting the second equation from the first eliminates y directly: (5x − y) − (2x − y) = 9 − 3. Simplifying gives 5x − 2x − y + y = 6, hence 3x = 6. Dividing both sides by 3 yields x = 2, so option B is correct. A check confirms the result: when x = 2, the first equation gives 10 − y = 9, so y = 1; the second gives 4 − 1 = 3, which is also true. The other values of x cannot produce one common value of y satisfying both original equations, so they are not valid solutions.

Related tags

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

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