Question

I'm very confused about some questions and don't really know how to answer them, so can someone help. The questions and my answers are down below. I need help urgently, please.

1.What is happening in terms of motion when a line segment crosses the x-axis of a position-time graph?

Motion becomes negative and it slows down.

2.What value of motion is represented by the slope of a line on a position-time graph?

Positive and increasing motion? I'm not sure

3.What does the sign, + or -, represent in terms of motion for a position-time graph?

The motion can be negative or positive.