Answer: Same slope.
- A Same y-intercept
- B Same slope
- C Slopes whose product is -1
- D No common slope
Correct answer: B. Same slope
Explanation: Parallel lines never meet and have equal slopes (m<sub>1</sub> = m<sub>2</sub>).
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.