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Which rule has initial value (140) and decrease of (10) per step?

Answer and explanation

Correct answer: \(y=140-10x\)

A linear rule has the form \(y=a+bx\), where \(a\) is the initial value and \(b\) is the change per step. Here, the initial value is 140 and the value decreases by 10 each step, so the change is \(-10\). Therefore, the rule is \(y=140-10x\). Option A represents an increase of 10 per step. Exam tip: words such as “decrease” or “decay” indicate a negative slope.

Related tags

Linear DecayLinear EquationsInitial ValueRate Of ChangePolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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