Match solutions and differential equations.

(Note: each equation may have more than one solution.)

(a) y′′ - y′ = 0
(b) x²y′′ - 2xy′ - 2y = 0
(c) x²y′′ - 6y = 0

(I) y = eˣ
(II) y = x³
(III) y = e⁻ˣ
(IV) y = x⁻²