Determine whether each first-order differential equation is separable, linear, both, or neither.

---

choose one Separable Linear Both Neither 1. $\displaystyle y' = x+y$

choose one Separable Linear Both Neither 2. $\displaystyle e^x \frac{dy}{dx}+1 = y$

choose one Separable Linear Both Neither 3. $\displaystyle y'+ xy = e^y$

choose one Separable Linear Both Neither 4. $\displaystyle x^2 \frac{dy}{dx} + e^x y = 1-3 x^3$

---

Note: You only have two attempts at this problem.

---