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If (\frac{x+y}{3}=7) and (\frac{x-y}{4}=2), what is the value of (x-y)?

Answer and explanation

Correct answer: (8)

The direct answer is option C: \(x-y=8\). The second given equation already has the exact expression asked for. Start with \(\frac{x-y}{4}=2\). Multiply both sides by 4: \(x-y=2\times4=8\). The first equation, \(\frac{x+y}{3}=7\), gives \(x+y=21\), but that information is not needed for this particular question. Option A, 6, is wrong because it does not follow from multiplying 2 by 4. Option B, 7, is wrong for the same reason. Option C, 8, is correct because the denominator 4 is removed by multiplication by 4. Option D, 9, is also unsupported. A common mistake is to solve for both x and y even when the requested expression is given directly. Exam cue: if the question asks for the numerator of a fraction, first clear its denominator.

Related tags

Linear EquationsTransformed EquationsDirect ValueHardClass 10

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