How to plot this equation?

Answer 1

[Star Strider]

syms t y 
f(t,y) = 2*y/t - (t*y)^2

f(t, y) = 

figure
fsurf(f, [-5 5  -5 5])
xlabel('t')
ylabel('y')
zlabel('f(t,y)')

It is necesary to plot it as a surface.

.

Answer 2

[Torsten]

fun = @(t,y) 2*y./t - t.^2.*y.^2;
t = 0.1:0.1:3;
y = 0:0.1:3;
[T,Y] = meshgrid(t,y);
surf(T,Y,fun(T,Y))