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Which option makes (y) decrease by (7) per step and has (y(8)=94)?

Answer and explanation

Correct answer: \(y=150-7x\)

A decrease of 7 per step means that the coefficient of \(x\) must be \(-7\). So the equation has the form \(y=a-7x\). Using \(y(8)=94\), we get \(a-7(8)=94\), so \(a=150\). Therefore, \(y=150-7x\) is correct. Option A has the correct rate of decrease, but it gives \(y(8)=38\). Exam tip: first identify the sign of the rate, then substitute the given condition to find the constant term.

Related tags

Linear DecayLinear EquationsPolynomial FunctionsSubstitutionRate Of ChangeLinear Growth And DecayIntroduction To PolynomialsMathematics

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