Question 388888
4, 5 and 6 can be skipped by using congruent supplements THM:
If 1 supp. 2
and if 3 supp. 4
and if 1 congruent 3
then 2 congruent 4


If you cant use congruent supplements THM:
4. Substitution
5. Substitution


#1 needs to be moved to after #4 because you do not need that until you try to make the two pairs of angles equal.