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If (y=85-5x), what is the value of (y) at (x=9)?

Answer and explanation

Correct answer: 40

Given \(y=85-5x\), substitute \(x=9\): \(y=85-5(9)=85-45=40\). Therefore, the correct value is 40. The value 45 is only \(5\times9\); it must be subtracted from 85. Exam tip: When evaluating a linear expression, substitute the given value first, multiply, and then perform addition or subtraction.

Related tags

Linear EquationsSubstitutionPolynomial EvaluationLinear DecayAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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