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If 5x + 6y = 142 and 6x + 5y = 144, what is x - y?

Answer and explanation

Correct answer: 2

The requested expression appears directly when the equations are subtracted. Subtract the first equation, 5x + 6y = 142, from the second equation, 6x + 5y = 144. On the left, 6x - 5x = x and 5y - 6y = -y, so the result is x - y. On the right, 144 - 142 = 2. Therefore x - y = 2, and option B is correct. There is no need to solve separately for x and y because the coefficients are arranged so that subtraction produces exactly the requested expression. Options A, C, and D do not follow from the direct subtraction and would result from an arithmetic or sign error.

Related tags

Pair-Of-Linear-EquationsEliminationExpression-ValueAlgebraic 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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