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If 2x + 4y = 28 and x − y = 2, what are the values of x and y?

Answer and explanation

Correct answer: x = 6, y = 4

The governing concept is substitution in a pair of linear equations. From x − y = 2, solve for x: x = y + 2. Substitute this into 2x + 4y = 28: 2(y + 2) + 4y = 28. Expanding and combining like terms gives 2y + 4 + 4y = 28, so 6y = 24 and y = 4. Substituting back into x = y + 2 gives x = 6. Therefore option A is correct. Verification shows 2(6) + 4(4) = 12 + 16 = 28 and 6 − 4 = 2. The pair in option B reverses the values and fails the equations, while options C and D also fail at least one original relation. Thus only option A is valid.

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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