Answer: (a,0).
- A (a,0)
- B (-a,0)
- C (0,a)
- D (0,-a)
Correct answer: A. (a,0)
Explanation: Standard parabola y² = 4ax: vertex at origin, focus at (a,0), directrix x = -a.
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.