The statements and Reasons correspond to each other by the numbers listed.
Let C = congruent in place of the congruent symbol. I don't have it on my keyboard.
Statements
1. Side MN C Side ON.
2. LN is C to LN.
3. Angle LNM is C to angle ONL
4. Angle NML is C to angle NOL
5. ML is C to OL
Reasons
1. Given
2. Reflexive Property
3. Definition of angle bisector
4. SAS Postulate
5. Side NL cuts MO in half
You need to find the slope too.

point slope formula y - y1 = m(x - x1)
use (0, -3)
y - (-3) = 1 (x -0)
y + 3 = 1x
I think 1,5 ? Might be very wrong but that’s my guess ♀️