size(8cm,0);
import graph;

xlimits( -100, 100);  
ylimits( -50, 50);  

defaultpen(overwrite(SuppressQuiet));

yaxis( "$y$" , Ticks(Label(.8red+fontsize(8),align=E)), p=.8red);
xaxis( "$x$", Ticks(Label(.8blue+fontsize(8))), p=.8blue);