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What is the solution of 5x + 2y = 34 and 3x + 2y = 22 by elimination?

Answer and explanation

Correct answer: (6, 2)

The governing concept is elimination of one variable from simultaneous linear equations. Both equations have the same y-term, 2y. Subtract the second equation from the first: (5x + 2y) − (3x + 2y) = 34 − 22. The y terms cancel, giving 2x = 12 and therefore x = 6. Substitute this into 3x + 2y = 22: 3(6) + 2y = 22, so 18 + 2y = 22, 2y = 4, and y = 2. Hence the solution is (6,2), option C. Checking gives 5(6)+2(2)=34 and 3(6)+2(2)=22. Every other listed ordered pair fails at least one original equation.

Related tags

Linear EquationsElimination MethodOrdered 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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