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If y = 2x + 3 and x + y = 15, which is the correct solution?

Answer and explanation

Correct answer: x = 4, y = 11

The governing concept is substitution in simultaneous linear equations. The first equation gives y directly, so place y = 2x + 3 into x + y = 15. We get x + (2x + 3) = 15, which simplifies to 3x + 3 = 15. Subtracting 3 gives 3x = 12, and division by 3 gives x = 4. Using the first equation, y = 2(4) + 3 = 11. Therefore option D is correct. Checking the pair gives 4 + 11 = 15 and 11 = 2(4) + 3. Option A has the correct sum but does not satisfy the first relation; B and C also fail one or 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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