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If x/3 + y/4 = 7 and x/4 + y/3 = 8, what is the value of x + y?

Answer and explanation

Correct answer: 180/7

The governing idea is to remove denominators before using elimination. The least common multiple of 3 and 4 is 12, so multiply both equations by 12. The first becomes 4x + 3y = 84, and the second becomes 3x + 4y = 96. Add these equations: 7x + 7y = 180. Factor the left side to get 7(x + y) = 180, and divide by 7: x + y = 180/7. Therefore option B is correct. Finding x and y separately is unnecessary because the requested sum appears immediately after addition. The integer choices 24, 26, and 28 are not equal to 180/7 and could arise from careless denominator clearing, incorrect addition, or rounding. Exact fraction arithmetic is required.

Related tags

Pair-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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