Where is the x-ray option in 2.8? I need to use the x-ray option for weight painting but I can only find the wireframe option using Z. Where can I find the x-ray?
If you're talking about the former Limit Selection to Visible:

It's now in the 3D view N panel > Tool tab > Brush > Options > 2D Falloff.



Or in the Properties editor > Active Tool tab > Brush > Options > 2D Falloff.