This graph is a straight line.
But I don know the value of x , so if I try an error
I assume that:
when x = 0,
f (x) = 1
when x = 1,
f (x) = 3
when x = 2,
f (x) = 9
when x = -1,
f (x) = 1/3
when x = -2,
f (x) = 1/9
when x = -3,
f (x) = 1 / 27
Those functions that I had written above are just an assumption , what you have to do is to find the value of x , if couldn't find then this graph will always remain unknown. Hope this help.