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What is the solution of x = 3y − 1 and x + y = 11?

Answer and explanation

Correct answer: x = 8, y = 3

The governing concept is the substitution method for simultaneous linear equations. One variable, x, is already expressed in terms of y as x = 3y − 1, so this expression can replace x in the second equation. Substitution gives (3y − 1) + y = 11. Combining like terms produces 4y − 1 = 11; adding 1 to both sides gives 4y = 12, and division by 4 gives y = 3. Now substitute y = 3 into x = 3y − 1: x = 3(3) − 1 = 9 − 1 = 8. Hence the solution is x = 8 and y = 3, so option A is correct. Checking gives 8 = 3(3) − 1 and 8 + 3 = 11. Each other option fails at least one original equation.

Related tags

Linear EquationsSubstitution MethodOrdered PairAlgebraAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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