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To determine the graph or to plot the graph you just need to use your function
Select three points of x in random eg 1 2 3
Use your equation to determine the corresponding values of y
eg when x = 1
Do the same for the other points. Then check to see which graph will fulfill the above points.
The graph is symmetric about the origin because every point on the right hand side is reflected on the left hand side and vice versa about the origin(0, 0)
You can read about other symmetrys here
To determine the increament or decreament value or interval. You look at the appearance of the graph.
Let me explain part c better
We use the x values to determine if the graph is increasing or decreasing.
the graph is increasing from point -infinity towards infinity
graph is decreasing from point infinity towards -infinity
Answer is therefore
The graph is decreasing on the interval (infinity) U (-infinity) and increasing on the interval (-infinity) U (infinity)
You can read more here for better understanding of part C
Hope everything is clear now. If not you are free to ask for clarifications
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