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What is the value of x from x/3 + y/4 = 5 and x/2 - y/5 = 3?

Answer and explanation

Correct answer: 210/23

First clear the denominators correctly. Multiplying x/3 + y/4 = 5 by 12 gives 4x + 3y = 60. Multiplying x/2 - y/5 = 3 by 10 gives 5x - 2y = 30. To eliminate y, multiply the first resulting equation by 2 and the second by 3: 8x + 6y = 120 and 15x - 6y = 90. Adding yields 23x = 210, so x = 210/23. Therefore option A is correct. The other options result from arithmetic or denominator-clearing errors. The originally supplied choices and key stated 270/23, but direct substitution confirms the corrected value: 210/23.

Related tags

Linear-EquationsFractional-EquationsElimination-MethodAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq

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