Dear student : First you find values of y for different values of x as follows using y = 1/x
if x = 2 than y = 1/2 = 0.5, like this you will get many values as shown below
x
1
2
3
-1
-2
-3
y=1/x
1
0.5
0.3333
-1
-0.5
-0.3333
after getting the above points just plot these on a graph paper ... you will get the following graph as shown If you have any doubt please feel free to ask !!