Geometry Question (Please Help)

1. Provide the missing reasons for the proof of part of the triangle midsegment theorem.

Given: K is the midpoint of MJ.

           L is the midpoint of NJ.

Prove: MN = 2KL

Statement:   ~   Reason:

1. K is the midpoint of MJ. L is the midpoint of NJ.  ~  Given

2. MK ≅ KJ and NL ≅ LJ  ~  Definition of Midpoint

3. MK = KJ and NL = LJ  ~  Segment Congruence Postulate

4. MJ = MK + KJ and NJ = NL + LJ  ~  Segment Addition Postulate

5. MJ = 2KJ and NJ = 2LJ  ~  Substitution Property of Equality

6. MJ/KJ = NJ/LJ = 2  ~  Division Property of Equality

7. ∠J ≅ ∠J  ~  Reflexive Property

8. ΔJMN ≅ ΔJKL  ~  AAA Postulate

9. MN/KL = MJ/KJ  ~  ???

10. MN/KL = 2  ~  ???

11. MN = 2KL  ~  ???

*** All bolded words are my answers. Can you please check them, and help me with the ??? answers.***

Thank you!!