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If 2x + 3y = 41 and 5x - 2y = 14, what is the value of 2x + y?

Answer and explanation

Correct answer: 425/19

Use elimination to solve the simultaneous equations. Multiply 2x + 3y = 41 by 2 to obtain 4x + 6y = 82. Multiply 5x - 2y = 14 by 3 to obtain 15x - 6y = 42. Adding eliminates y and gives 19x = 124, so x = 124/19. Substitute this into the first equation: 2(124/19) + 3y = 41 = 779/19. Hence 3y = 531/19 and y = 177/19. The required expression is therefore 2x + y = 248/19 + 177/19 = 425/19. Option C is correct. The nearby alternatives result from errors in multiplying equations, adding constants, or combining the final fractions, and they do not give the value of the requested expression.

Related tags

Pair-Of-Linear-EquationsEliminationAlgebraic-ExpressionSimultaneous-EquationsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathemat

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