Syntax for Differential Equations Solver / desolve()???

[ewjax]

Has anyone been able to figure out the proper syntax for the desolve() command? I have tried everything I can think of, and each time receive an error message "Error: Bad Argument Value"

Very simple example problem: y' = 2x + 4
Solution: y = x^2 + 4x + C

However, desolve(y'=2x + 4, x, y) as well as desolve(y'=2x+4, y) both give the "Bad Argument Value" error message. In fact, so do the examples from the "Help" system, when I use the "Exampl" key to copy them into the command line to try them.

Any advice?

Thanks.