I have discovered the solution for the differential equation. I have:(adsbygoogle = window.adsbygoogle || []).push({});

DSolve[{y'[x] == 3 + 1/x}, y, x]

and got

{{y -> Function[{x}, 3 x + C[1] + Log[x]]}}

I'd like to make y a function of z, for example. I just would like to be able to use the function another time, evaluating y[2] for example.

I tried a[x_] = DSolve[{y'[x] == 3 + 1/x}, y, x] but failed

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# Creating a function from DSolve output

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