0 reads0 ratings0 helpful
If (y=200-kx) and (y=136) at (x=8), what is (k)?
Advertisement
Answer and explanation
Correct answer: 8
At \(x=8\), the value of \(y\) is 136. Substituting in the equation gives \(136=200-8k\). Hence, \(8k=64\), so \(k=8\). Note that 64 is the value of \(8k\), not of \(k\). Exam tip: Substitute the given values first, then isolate the unknown term carefully.
Frequently asked questions
What is the correct answer to this question?
8
Why is this the correct answer?
At \(x=8\), the value of \(y\) is 136. Substituting in the equation gives \(136=200-8k\). Hence, \(8k=64\), so \(k=8\). Note that 64 is the value of \(8k\), not of \(k\). Exam tip: Substitute the given values first, then isolate the unknown term carefully.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear growth and decay.
Student feedback
Was this question useful?
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Difficulty
Easy0%
Medium0%
Hard0%
Was the explanation clear?
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
Advertisement