Not getting any plots on my graph

My graph using parametric equations isn't showing any plots, just an empty graph and I'm unsure why.

t=linspace(0, 20);
x=4 + sqrt(t);
y=5+cos(2*t)/(t+1);
plot(x,y)
xlabel 'x displacement'
ylabel 'y displacement'

[per isakson]

Replace

y=5+cos(2*t)/(t+1);

by

y=5+cos(2*t)./(t+1);

and see https://se.mathworks.com/help/matlab/ref/mrdivide.html