In each of Problems 1 to 3, express the general solution of the nonhomo-geneous DE as the sum of a particular solution and the general solution of the corresponding homogenenous equation. The homogeneous equations are linear or separable; particular solutions (mostly constant) may be found by inspection.
1. y' - y = 3
2. y' + 2y = -1/2
3. y + 1/t y = 1/t