The line (y=-7x+c) has (y)-intercept (3). What will (y) be at (x=-2)?
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Answer and explanation
Correct answer: 17
In the form y=-7x+c, the y-intercept is c. Since the y-intercept is 3, c=3. Substituting x=-2 gives y=-7(-2)+3=14+3=17. Hence, 17 is correct. The value 14 comes only from -7(-2); the y-intercept 3 must also be added. Exam tip: When the y-intercept is given, use it as the constant term c.
Frequently asked questions
What is the correct answer to this question?
17
Why is this the correct answer?
In the form y=-7x+c, the y-intercept is c. Since the y-intercept is 3, c=3. Substituting x=-2 gives y=-7(-2)+3=14+3=17. Hence, 17 is correct. The value 14 comes only from -7(-2); the y-intercept 3 must also be added. Exam tip: When the y-intercept is given, use it as the constant term 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.
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