you need to retain the values of y as you go through each iteration of the loop. There are a few ways of doing it, but perhaps the quick and dirty way in the context of your loop is:
x=[0:0.1:1];
y=[];
for i=0:0.1:1
y=[y 2*(-88404*i*(1-i)*(6*(i-1)-4.1*i))/(12640.5*(1-i)+16860*((6-4.1)*i-6)*(-2)*(((4.1-6)*i)+6)+618272*(i^2))]
x1=i;
y1=(-105258*i*(1-i))/(69126*i+101160*(1-i)-12640.5*(1-i))
end
plot (x,y,'o-')
