Which rule has initial value (64) and decay rate (8)?
Answer and explanation
Correct answer: \(y=64-8x\)
A linear decay rule has the form \(y=a-rx\), where \(a\) is the initial value and \(r\) is the decay rate. Substituting \(a=64\) and \(r=8\) gives \(y=64-8x\). Option A represents growth by 8, not decay. Exam tip: the initial value is the constant term, and decay has a negative coefficient of \(x\).
Frequently asked questions
What is the correct answer to this question?
\(y=64-8x\)
Why is this the correct answer?
A linear decay rule has the form \(y=a-rx\), where \(a\) is the initial value and \(r\) is the decay rate. Substituting \(a=64\) and \(r=8\) gives \(y=64-8x\). Option A represents growth by 8, not decay. Exam tip: the initial value is the constant term, and decay has a negative coefficient of \(x\).
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear growth and decay.
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