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If (y=150-kx) and (y=110) at (x=5), what is (k)?
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Answer and explanation
Correct answer: 8
At \(x=5\), we are given \(y=110\). Substituting gives \(110=150-5k\). Hence, \(5k=40\), so \(k=8\). Note that \(40\) is the value of \(5k\), not of \(k\). Exam tip: Substitute the given values of \(x\) and \(y\) first, then isolate the unknown term.
Frequently asked questions
What is the correct answer to this question?
8
Why is this the correct answer?
At \(x=5\), we are given \(y=110\). Substituting gives \(110=150-5k\). Hence, \(5k=40\), so \(k=8\). Note that \(40\) is the value of \(5k\), not of \(k\). Exam tip: Substitute the given values of \(x\) and \(y\) first, then isolate the unknown term.
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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