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If (y=15+5x), which value of (x) gives (y=55)?
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Answer and explanation
Correct answer: 8
Given y=15+5x and y=55, substitute 55 for y: 15+5x=55. Thus, 5x=40 and x=8. Therefore, 8 is the correct option. For example, if x=7, then y=15+35=50, not 55. Exam tip: In a linear expression, substitute the given value of y and isolate the term containing x first.
Frequently asked questions
What is the correct answer to this question?
8
Why is this the correct answer?
Given y=15+5x and y=55, substitute 55 for y: 15+5x=55. Thus, 5x=40 and x=8. Therefore, 8 is the correct option. For example, if x=7, then y=15+35=50, not 55. Exam tip: In a linear expression, substitute the given value of y and isolate the term containing x first.
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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