Answer:
see screenshot
Step-by-step explanation:
The slope is positive wherever the line is going UP like this ---> /
The slope is negative if the line is going down like like --> \
Flat means neither.
So as you move from left to right, is it increasing? Then it's positive.
As you move from left to right, if it's decreasing, then it's negative.
I have attached a screenshot with RED showing increasing/positive slope segments.