Question 5547
just plug in random values for x and plot the (x,y) coordinates

If x = 1, then y = {{{y=2^1-1)}}} so y=2  plot the point (1,2)
If x = 0 {{{y=2^0-1)}}} so y=1  plot the point (0,1)
If x = -1 {{{y=2^-1-1)}}} y = -1/2 plot the point (-1,-1/2)
If x = 2 {{{y=2^2-1)}}} y = 3 plot the point (2,3)

and so on... the more points you find, the more defined the graph.