What is the (y)-intercept of the equation (3y=9x-15)?
Answer and explanation
Correct answer: -5
To find the y-intercept, put x=0. Then 3y=9(0)-15=-15, so y=-5. Therefore, the line crosses the y-axis at -5. Taking -15 as the y-intercept is incorrect because it is the constant term before dividing the equation by 3. Exam tip: for the y-intercept, always substitute x=0.
Frequently asked questions
What is the correct answer to this question?
-5
Why is this the correct answer?
To find the y-intercept, put x=0. Then 3y=9(0)-15=-15, so y=-5. Therefore, the line crosses the y-axis at -5. Taking -15 as the y-intercept is incorrect because it is the constant term before dividing the equation by 3. Exam tip: for the y-intercept, always substitute 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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