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If (y=21+7x), which value of (x) gives (y=77)?
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Answer and explanation
Correct answer: 8
Given \(y=21+7x\) and \(y=77\), we get \(21+7x=77\). Thus, \(7x=56\), so \(x=8\). Therefore, 8 is the correct option. For instance, if \(x=7\), then \(y=70\), not 77. In exams, substitute the given value of \(y\) into the equation and solve for \(x\).
Frequently asked questions
What is the correct answer to this question?
8
Why is this the correct answer?
Given \(y=21+7x\) and \(y=77\), we get \(21+7x=77\). Thus, \(7x=56\), so \(x=8\). Therefore, 8 is the correct option. For instance, if \(x=7\), then \(y=70\), not 77. In exams, substitute the given value of \(y\) into the equation and solve for \(x\).
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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