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Which option makes (y) increase by (12) per step and has (y(6)=101)?

Answer and explanation

Correct answer: \(y=29+12x\)

An increase of 12 per step means that the coefficient of \(x\) must be \(12\). Let \(y=a+12x\). Using \(y(6)=101\), we get \(a+12\times6=101\), so \(a=29\). Hence, \(y=29+12x\) is correct. Option C does give \(y(6)=101\), but its coefficient is \(-12\), so it represents decay rather than growth. Exam tip: first check the sign of the rate of change, then substitute the given value to find the constant term.

Related tags

Linear FunctionsLinear GrowthPolynomialsRate Of ChangeSubstitutionLinear Growth And DecayIntroduction To PolynomialsMathematics

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