What are the slope and (y)-intercept of the line (y=-9)?
Answer and explanation
Correct answer: Slope 0 and y-intercept -9
In the equation y = -9, the value of y remains constant for every value of x. Therefore, it is a horizontal line parallel to the x-axis, so its slope is 0. Putting x = 0 gives y = -9, hence the y-intercept is -9. Option B has the correct slope but the wrong sign for the y-intercept. Exam tip: every line of the form y = c has slope 0 and y-intercept c.
Frequently asked questions
What is the correct answer to this question?
Slope 0 and y-intercept -9
Why is this the correct answer?
In the equation y = -9, the value of y remains constant for every value of x. Therefore, it is a horizontal line parallel to the x-axis, so its slope is 0. Putting x = 0 gives y = -9, hence the y-intercept is -9. Option B has the correct slope but the wrong sign for the y-intercept. Exam tip: every line of the form y = c has slope 0 and y-intercept c.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Slope and y-intercept.
