How do i graph the exponential function #f(x)=(1/5)^x# on a TI-83?
Problem could be your Windows setting. To start with I would set the x-windows from x-min=-5 to x-max=+5 and the y-window from y-min=-1 to y-max=+1.
This will give you a reasonable view of the graph. You can always expand or contract from there.