Changing the value y axis to zero in a graph

[RandyTampa]

Trying to graph a few relationships to 0 on the y-axis, but the graph won't display anything but curves that begin at 1 (yes, I do have values corresponding to Y=0).

When I try to format X by setting the value Y axis to 0, I get a pop-up saying that I have to choose a value between 1 and 31999. I know other's have done this--any idea what's wrong here?
thanks

 

[Oaktree]

It sounds like you are using a line graph. Try using an X-Y scatter instead.