Question

Given: Line I and line m intersect

Prove: 1~3
X
4
m
3
Statements
1. Line I and line m intersect
2. 1 is supplementary to 2
3.?
4. 13
Reasons
1. given
2. linear pair theorem
3.?
4. congruent supplements theorem
Which statement and reason best completes the proof?


HELP i’m not good at math :(

Answer 1

D because if you say angle 2 + angle 1 = 180 = angle 2 + angle 3, then, subtracting angle 2 from all sides (180 irrelevent), you can say angle 1 = angle 3.

:D