Answer: x = 0.
- A y = 0
- B x = 0
- C y = x
- D x = 1
Correct answer: B. x = 0
Explanation: The y-axis is where x = 0.
The slope of a line is the ratio of vertical change (rise) to horizontal change (run) between any two points on it - equivalently, the tangent of the angle θ the line makes with the positive x-axis.