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**[SOLVED] IVP and DE problem**

**1. Homework Statement**

1) Find a solution to the IVP y" = -9y, y'(0) = 3, and y(0) = 6

2) Is y(x) = (21+6x)^1/3 a solution to the DE y' = 2/y^2

**3. The Attempt at a Solution**

For the first one I think it has something to do with sin/cos but I don't know what to do. As for the second one maybe something with y=Ae^kt. Any help would be appreciated.