(a) Solve the following differential equation: dy/dx=(2- y)/(x +1)

Solve the following differential equation :

$$\frac{\mathrm{dy}}{\mathrm{dx}}=\frac{2-\mathrm{y}}{\mathrm{x}+1}$$

If $\displaystyle \int_{\mathrm{a}}^{\mathrm{b}} \mathrm{x}^3 \mathrm{~dx}=0$ and $\displaystyle \int_{\mathrm{a}}^{\mathrm{b}} \mathrm{x}^2 \mathrm{~dx}=\frac{2}{3}$, then find the values of ‘a’ and ‘b’.