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If (y=75-4.5x), what is (y) at (x=10)?

Answer and explanation

Correct answer: 30

Substitute x=10: y=75-4.5(10)=75-45=30. Therefore, 30 is the correct answer. The value 35 can result from incorrectly taking 4.5×10 as 40. In exams, take care of the decimal place when multiplying by 10.

Related tags

Linear EquationsSubstitutionDecimal MultiplicationLinear DecayPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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