Question

So i need reasons for each of these i legit have no idea how to do proofs

Answer 1

Yes they are in order

Answer 2

$\begin {array}{l|l||l}\underline{\quad Statement\quad&\underline{\qquad Reason\qquad}&\underline{\qquad Side\ Note\qquad}\\ 3x-4=2(x+8)&\text{Given}&\\3x-4=2x+16&\text{Distributive Property}&\text{multiplied 2 into x+8}\\3x=2x+20&\text{Addition Property}&\text{added 4 to both sides}}\\x=20&\text{Subtraction Property}&\text{subtracted x from both sides}\\\end{array}$

NOTE:

The Statement is what was provided, Reason is the justification (proof), Side Note is JUST FOR YOU so you understand why the answer for the Reason was chosen.