Answer: x = 0.
- A x = 0
- B y = 0
- C x² + y² = 9
- D y = x
Correct answer: A. x = 0
Explanation: Points equidistant from (3,0) and (-3,0) lie on the perpendicular bisector of segment joining them: 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.