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Which option makes (y) increase by (9) per step and has (y(4)=61)?

Answer and explanation

Correct answer: \(y=25+9x\)

An increase of 9 per step requires a linear expression with coefficient 9, so \(y=a+9x\). Using \(y(4)=61\), we get \(a+9(4)=61\), hence \(a=25\). Therefore, \(y=25+9x\) is correct. Although \(y=61+9x\) also has rate 9, it gives \(y(4)=97\), not 61. Exam tip: substitute the given \(x\)-value into an option to check the condition quickly.

Related tags

Linear EquationsLinear GrowthPolynomial EvaluationRate Of ChangeModel SelectionLinear Growth And DecayIntroduction To PolynomialsMathematics

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