i need help in this ~

i need to fill out the rest of the proof proving table.
STATEMENT REASON
1.∠1 and ∠2 are supplementary angles 1. Given
2. m∠1 + m∠2 = 180° 2.
3. ∠1 and ∠3 are supplementary angles 3. Exterior
sides in
opposite rays
4. 4.
5. m∠1 + m∠2 = m∠1 + m∠3 5.
6. 6.
7. l || m 7.

Question

i need help in this ~ 

i need to fill out the rest of the proof proving table. 
STATEMENT	REASON
1.∠1 and ∠2 are supplementary angles	1.  Given
2. m∠1 + m∠2 = 180°	                        2.
3. ∠1 and ∠3 are supplementary angles	3. Exterior  
                                                                 sides in
                                                           opposite rays
4.	                                                  4.
5. m∠1 + m∠2 = m∠1 + m∠3	5.
6.	                                                  6.
7. l || m	                                          7.

anonymous · Answer

attachment

anonymous · Answer

i need help !

perl · Answer

can you show any work you have done

anonymous · Answer

well ~ for the reason 2. i thought it could be definition for supplementary, cuz they both = to 180 and thats what supplement is right ?

anonymous · Answer

well ~ for the reason 2. i thought it could be definition for supplementary, cuz they both = to 180 and thats what supplement is right ?

perl · Answer

yes thats correct . def. of supplementary angles

anonymous · Answer

ohhh ! alright ill put that in !

anonymous · Answer

ohhh ! alright ill put that in !

anonymous · Answer

now for reason and statement 4 ~ that looks  confusing ~