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If x = 3y and x + y = 16, what are the values of x and y?

Answer and explanation

Correct answer: x = 12, y = 4

The governing concept is substitution. Since the first equation already expresses x in terms of y, replace x by 3y in the second equation. This gives 3y + y = 16, so 4y = 16 and y = 4. Substituting y = 4 back into x = 3y gives x = 3 × 4 = 12. Hence the solution is (x, y) = (12, 4), which is option C. Verification is straightforward: x = 3y becomes 12 = 3 × 4, and x + y becomes 12 + 4 = 16. Option A does not satisfy x = 3y, while B and D fail either the stated relation or the sum. Thus only option C is consistent with both equations.

Related tags

Linear EquationsSubstitution MethodSolution PairClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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