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Solving 0.25x + y = 9 and x - 0.5y = 2, what is the value of y?

Answer and explanation

Correct answer: 68/9

The governing concept is solving a linear system accurately after clearing decimal coefficients. Multiply 0.25x + y = 9 by 4 to obtain x + 4y = 36. Multiply x - 0.5y = 2 by 2 to obtain 2x - y = 4. From the second equation, x = 2 + y/2. Substitute this into the first: 2 + y/2 + 4y = 36. Since y/2 + 4y = 9y/2, we get 9y/2 = 34. Multiplying by 2 gives 9y = 68, hence y = 68/9. Therefore option C is correct. The decimal equations are equivalent to the multiplied equations, so no solution is lost. The values 6, 7, and 9 fail at least one original equation; rounding would also destroy the exact result.

Related tags

Pair-Linear-EquationsDecimal-CoefficientsSubstitution-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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