Straight-line graphs: y = mx + c

1. What is the gradient of y = 3x + 2?
- Correct answer: 3
- 2
- 5
- 3x
2. Where does y = 3x + 2 cross the y-axis?
- Correct answer: (0, 2)
- (2, 0)
- (0, 3)
- (3, 2)
3. Which line is parallel to y = 2x + 1?
- Correct answer: y = 2x − 5
- y = x + 2
- y = −2x + 1
- y = ½x + 1
4. What is the gradient of the line through (0, 0) and (2, 6)?
- Correct answer: 3
- 2
- 6
- 1/3
5. Which line has a negative gradient?
- Correct answer: y = 5 − 2x
- y = 2x − 5
- y = x + 5
- y = 5x
6. What is the equation of the horizontal line through (0, 4)?
- Correct answer: y = 4
- x = 4
- y = 4x
- y = x + 4

Options