Given the following notation from your e-mail

dx-4y^3=0

I assume this means

or

Lets us the Mathcad function Odesolve(a,b,N ) where:

a = variable of integration,
b = terminal point of integration interval,
N = number of steps [optional]

Note: this can be solved by separating the variables and integrating by hand thus:

yielding:

For this problem, I'll let N = 100

Using the Odesolve block (carefully note the syntax!):

so the solution (letting c = 0) is:

the solution graph is shown below: