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If (y=64-3.5x), what is (y) at (x=12)?

Answer and explanation

Correct answer: 22

Given \(y=64-3.5x\). Substituting \(x=12\), we get \(y=64-3.5\times12=64-42=22\). Therefore, 22 is correct. The value 24 would result only if the amount subtracted were 40, but \(3.5\times12=42\). Exam tip: Multiply the decimal rate by the given value first, then subtract.

Related tags

Linear EquationsSubstitutionDecimal MultiplicationLinear DecayPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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