the bottom the range has the same numbers so I just need the domain and range help plz!!

How to identify domain and range from co-ordinate pairs?
Domain=x
Range=y
Hence.
In the graph here
[tex]\\ \sf\longmapsto D_f=0\leqslant x\leqslant y[/tex]
[tex]\\ \sf\longmapsto R_f=0\leqslant y\leqslant 14[/tex]