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If (y=30+6x), which value of (x) makes (y) equal to (11x)?

Answer and explanation

Correct answer: \(x=6\)

Given \(y=30+6x\) and the condition \(y=11x\), we get \(30+6x=11x\). Subtracting \(6x\) from both sides gives \(30=5x\), so \(x=6\). For example, at \(x=5\), the first expression gives \(60\), whereas \(11x=55\), so it is not correct. Exam tip: first equate the two expressions for \(y\), then collect like terms on one side.

Related tags

Linear EquationsPolynomialsSolve For XAlgebraic ExpressionsSubstitutionLinear Growth And DecayIntroduction To PolynomialsMathematics

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