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Which option makes (y) decrease by (16) per step and has (y(5)=78)?

Answer and explanation

Correct answer: \(y=158-16x\)

A decrease of 16 per step means that the coefficient of \(x\) must be \(-16\). So write the equation as \(y=a-16x\). Using \(y(5)=78\), we get \(a-16(5)=78\), hence \(a=158\). Therefore, \(y=158-16x\) is correct. In option A, the constant is 78, so \(y(5)=-2\), not 78. Exam tip: substitute the given \(x\)-value into each likely equation to check the condition quickly.

Related tags

Linear DecayLinear EquationsPolynomialsSubstitutionAlgebraic ModellingLinear Growth And DecayIntroduction To PolynomialsMathematics

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