Question: Monotonic/monotone line

Hello. In our math lessons, we are laerning about monotonicity within different graph and hereby, we are also working with making a line, describing when the graph is increasing or descreasing (I have uploaded a picture along to describe). 

I havent been able to find any easy way to make a monotonic line within maple, where i dont have to draw them in. This is problematic and will end up taking me a long time in each assignment where its needed. 
Kinds regrads. Samuel Hesselberg

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