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If (y=45+kx) and (y=81) at (x=6), what is (k)?
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Answer and explanation
Correct answer: 6
Substituting the given values into y=45+kx gives 81=45+6k. Hence, 6k=36 and k=6. Option 36 is only the difference 81-45; it must be divided by x=6 to find k. Exam tip: In a linear equation, substitute the given x and y values before solving for the unknown coefficient.
Frequently asked questions
What is the correct answer to this question?
6
Why is this the correct answer?
Substituting the given values into y=45+kx gives 81=45+6k. Hence, 6k=36 and k=6. Option 36 is only the difference 81-45; it must be divided by x=6 to find k. Exam tip: In a linear equation, substitute the given x and y values before solving for the unknown coefficient.
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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