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Which option makes (y) decrease by (9) per step and has (y(6)=58)?

Answer and explanation

Correct answer: \(y=112-9x\)

A decrease of 9 per step means that the coefficient of \(x\) must be \(-9\). So write the equation as \(y=a-9x\). Using \(y(6)=58\), we get \(a-9(6)=58\), hence \(a=112\). Therefore, \(y=112-9x\) is correct. Option A has slope \(-9\), but it gives \(y(6)=4\), not 58. Exam tip: substitute the given \(x\)-value into each option to check the condition quickly.

Related tags

Linear DecayLinear EquationPolynomialsSubstitutionRate Of ChangeLinear Growth And DecayIntroduction To PolynomialsMathematics

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