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If 6x - 5y = 8 and 9x + 10y = 83, what is the value of x + y?

Answer and explanation

Correct answer: 307/35

Use elimination because multiplying the first equation by 2 creates -10y, which cancels the +10y in the second equation. Thus 2(6x - 5y = 8) gives 12x - 10y = 16. Add this to 9x + 10y = 83: 21x = 99, so x = 33/7. Substitute this into the first equation: 6(33/7) - 5y = 8. Since 6(33/7)=198/7 and 8=56/7, we obtain 5y=142/7 and y=142/35. Convert x to denominator 35: x=165/35. Therefore x+y=(165+142)/35=307/35, so option B is correct. The integer distractors 8, 9, and 10 are not the exact sum and do not satisfy the solved system.

Related tags

Pair-Linear-EquationsElimination-MethodLinear-ExpressionAlgebraic 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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