size(8cm,0);
import graph;

xlimits( -100, 100);
ylimits( -50, 50);
yaxis( "$y$" , Ticks(Label(currentpen+fontsize(8),align=E)));
xaxis( "$x$", Ticks(Label(currentpen+fontsize(8))));

    
size(8cm,0,false);
import graph;

xlimits( -100, 100);
ylimits( -50, 50);
yaxis( "y" , RightTicks());
xaxis( "x", Ticks());

    
size(8cm,0,false);
import graph;  

xlimits(0, 200);  
ylimits(-50, 50);  
yaxis( "y-value", Left);
xaxis( "x-value", Bottom(true));

    
size(8cm,0,false);
import graph;

xlimits(0, 200);
ylimits(-50, 50);
yaxis("y-value");
xaxis("x-value");