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If (y=42-2.5x), what is (y) at (x=8)?

Answer and explanation

Correct answer: 22

Substitute x=8 into the given equation: y=42-2.5×8. Since 2.5×8=20, y=42-20=22. Therefore, 22 is the correct option. A result such as 24 may arise from an error in multiplication or subtraction. Exam tip: First multiply the decimal coefficient by x, then subtract from the constant term.

Related tags

Linear EquationsSubstitutionDecimal ArithmeticLinear DecayPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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