If (y=64-3.5x), what is (y) at (x=12)?
Answer and explanation
Correct answer: 22
Given \(y=64-3.5x\). Substituting \(x=12\), we get \(y=64-3.5\times12=64-42=22\). Therefore, 22 is correct. The value 24 would result only if the amount subtracted were 40, but \(3.5\times12=42\). Exam tip: Multiply the decimal rate by the given value first, then subtract.
Frequently asked questions
What is the correct answer to this question?
22
Why is this the correct answer?
Given \(y=64-3.5x\). Substituting \(x=12\), we get \(y=64-3.5\times12=64-42=22\). Therefore, 22 is correct. The value 24 would result only if the amount subtracted were 40, but \(3.5\times12=42\). Exam tip: Multiply the decimal rate by the given value first, then subtract.
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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