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What is the value of (x) from (\frac{x}{4}+\frac{y}{7}=6) and (x-y=5)?

Answer and explanation

Correct answer: (x=\frac{188}{11})

The direct answer is option A: \(x=\frac{188}{11}\). We solve step by step. From \(x-y=5\), add y to both sides: \(x=y+5\), or equivalently \(y=x-5\). In the first equation, \(\frac{x}{4}+\frac{y}{7}=6\), multiply every term by 28, the least common denominator: \(7x+4y=168\). Substitute \(y=x-5\): \(7x+4(x-5)=168\). Thus \(7x+4x-20=168\), so \(11x=188\), and \(x=\frac{188}{11}\). Option A is correct. Option B, \(\frac{178}{11}\), would result from an arithmetic error after combining terms. Option C, \(\frac{168}{11}\), forgets the 20 produced by substitution. Option D, \(\frac{158}{11}\), has an even larger subtraction error. Always multiply the complete equation by 28, not just one term, and check the result by substituting back.

Related tags

Linear EquationsFraction EquationsSubstitutionHardClass 10

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