Is there any way to reverse an axis in the plot command? I solved the baristochrone problem as 

a school project,but I did it using an upside-down Y axis. Of course, when I try to make a graph with

my solution, I'm getting a regular cycloid instead of an inverted one, since I was using a 

reverted Y axis when solving the problem. 

Help would be very appreciated as I couldn,t find anything on the subject.