Could someone please explain these 2 problems for me?

#1: If $\displaystyle 0 <x < {\pi}$ and $\displaystyle sinx + cosx = \frac{1}{5}$, then find tan x.

#2: What are the solutions for $\displaystyle sec[arctan(\frac{-3}{5})]$ and $\displaystyle sin[arcsin(\frac{5}{13}) - arccos(\frac{-3}{5})]$?

Thank you!!!