posted by David .
Write a justification for each step
Given: AB = EF, B is the midpoint of Line AC and E is the midpoint of Line DF.
1. B is the midpoint of Line AC and E is the midpoint of Line DF.
2. Line AB is congruent to Line BC and Line DE is congruent to Line DF
3. AB = BC, and DE = EF
4. AB + BC = AC and DE + EF = DF
5. 2AB = AC, and 2EF = DF
6. AB = EF
7. 2AB = 2EF
8. AC = DF
9. Line AC is congruent to Line DF
What are the justfications?