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If (y=165-12x), which value of (x) gives (y=45)?
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Answer and explanation
Correct answer: 10
Given \(y=165-12x\) and \(y=45\), we get \(165-12x=45\). Subtracting 165 from both sides gives \(-12x=-120\), so \(x=10\). If \(x=9\), then \(y=57\), not 45. Exam tip: Track signs carefully when transposing or simplifying negative terms.
Frequently asked questions
What is the correct answer to this question?
10
Why is this the correct answer?
Given \(y=165-12x\) and \(y=45\), we get \(165-12x=45\). Subtracting 165 from both sides gives \(-12x=-120\), so \(x=10\). If \(x=9\), then \(y=57\), not 45. Exam tip: Track signs carefully when transposing or simplifying negative terms.
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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