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What is the value of (y) at (x=0) in the line (y=-x+8)?
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Answer and explanation
Correct answer: \(8\)
Substituting \(x=0\) in \(y=-x+8\) gives \(y=-(0)+8=8\). Hence, \(8\) is correct; it is also the \(y\)-intercept of the line. \(-1\) is the coefficient of \(x\), not the value of \(y\) when \(x=0\). Exam tip: To find the \(y\)-intercept, always put \(x=0\).
Frequently asked questions
What is the correct answer to this question?
\(8\)
Why is this the correct answer?
Substituting \(x=0\) in \(y=-x+8\) gives \(y=-(0)+8=8\). Hence, \(8\) is correct; it is also the \(y\)-intercept of the line. \(-1\) is the coefficient of \(x\), not the value of \(y\) when \(x=0\). Exam tip: To find the \(y\)-intercept, always put \(x=0\).
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Slope and y-intercept.
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