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If x/2 + y/3 = 7 and x/3 + y/2 = 8, what is the value of x + y?

Answer and explanation

Correct answer: 18

The governing concept is clearing denominators before applying elimination. The least common multiple of 2 and 3 is 6, so multiply both equations by 6. They become 3x + 2y = 42 and 2x + 3y = 48. Adding these equations gives 5x + 5y = 90. Factor out 5: 5(x+y)=90, and divide by 5 to obtain x+y=18. It is unnecessary to calculate x and y separately because the requested sum appears directly. For verification, subtracting the equations gives x-y=-6; together with x+y=18 this gives x=6 and y=12, which satisfy the original fractional equations: 3+4=7 and 2+6=8. Hence option B is correct.

Related tags

Pair-Of-Linear-EquationsFractionsEliminationLeast-Common-MultipleMathematicsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two Variables

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