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If (y=36+8x), which value of (x) gives (y=100)?
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Answer and explanation
Correct answer: 8
Given y=36+8x and y=100, substitute 100 for y: 36+8x=100. Thus, 8x=64 and x=8. Checking, x=8 gives y=36+8(8)=36+64=100. For x=7, y=92, so it is not correct. Exam tip: Substitute the target value of y first, then isolate the term containing x.
Frequently asked questions
What is the correct answer to this question?
8
Why is this the correct answer?
Given y=36+8x and y=100, substitute 100 for y: 36+8x=100. Thus, 8x=64 and x=8. Checking, x=8 gives y=36+8(8)=36+64=100. For x=7, y=92, so it is not correct. Exam tip: Substitute the target value of y first, then isolate the term containing x.
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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