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Find the solution of 2x + 5y = 26 and 3x + 5y = 29 by elimination.

Answer and explanation

Correct answer: (3, 4)

The governing concept is the elimination method for a pair of simultaneous linear equations. Because the coefficients of y are both 5, subtract the first equation from the second: (3x + 5y) − (2x + 5y) = 29 − 26. The y terms cancel, leaving x = 3. Substitute x = 3 into 2x + 5y = 26: 2(3) + 5y = 26, so 6 + 5y = 26, 5y = 20, and y = 4. Therefore the ordered solution is (3, 4), so option D is correct. Verification gives 2(3) + 5(4) = 26 and 3(3) + 5(4) = 29. The other ordered pairs fail at least one original equation.

Related tags

Linear EquationsElimination MethodSimultaneous EquationsClass 10Algebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematics

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