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If (y=210-12x), which value of (x) makes (y) equal to (3x)?

Answer and explanation

Correct answer: \(x=14\)

Given \(y=210-12x\) and the condition \(y=3x\), substitute the expression for \(y\): \(210-12x=3x\). Adding \(12x\) to both sides gives \(210=15x\), so \(x=14\). Option \(x=15\) may seem close, but then \(y=30\) while \(3x=45\), so they are not equal. Exam tip: when a condition is given for a variable, substitute the provided expression before solving.

Related tags

Linear EquationsPolynomialsSubstitutionSolve For XAlgebraic ExpressionsLinear Growth And DecayIntroduction To PolynomialsMathematics

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