Answer: 3.
- A 2
- B 3
- C 4
- D 9
Correct answer: B. 3
Explanation: For x²/a² + y²/b² = 1, a = 3 (larger denominator under x²). Semi-major axis = 3.
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.