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If (y=80-5x), which value of (x) makes (y) equal to (3x)?

Answer and explanation

Correct answer: \(x=10\)

Given \(y=80-5x\) and the condition \(y=3x\), set the two expressions equal: \(80-5x=3x\). Adding \(5x\) to both sides gives \(80=8x\), so \(x=10\). If \(x=8\), then \(y=40\) while \(3x=24\), so it does not satisfy the condition. Exam tip: When two expressions represent the same variable, equate them and solve the resulting linear equation.

Related tags

Linear EquationsPolynomialsSubstitutionAlgebraic ExpressionsLinear Growth And DecayIntroduction To PolynomialsMathematicsClass 9 Mcq

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