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Which option makes (y) decrease by (4) per step and has (y(7)=73)?

Answer and explanation

Correct answer: \(y=101-4x\)

A decrease of 4 per step means the coefficient of \(x\) must be \(-4\). So the equation has the form \(y=a-4x\). Using \(y(7)=73\), we get \(a-4(7)=73\), so \(a=101\). Therefore, \(y=101-4x\) is correct. In option A, the initial value is 73, giving \(y(7)=45\), not 73. Exam tip: substitute the given \(x\)-value into each suitable option to check the condition quickly.

Related tags

Linear EquationsLinear DecayFunction EvaluationPolynomialsAlgebraic ModellingLinear Growth And DecayIntroduction To PolynomialsMathematics

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