The giving graph is a representation of kinetics of a reaction.
The y and x axes for zero and first order reactions, respectively are
(1) zero order (y = rate and x = concentration), first order (y = t1/2 and x = concentration)
(2) zero order (y = rate and x = concentration), first order (y = rate and x = t1/2)
(3) zero order (y = concentration and x = time), first order (y = t1/2 and x = concentration)
(4) zero order (y = concentration and x = time), first order (y = rate constant and x = concentration)