Answer:
Hello. Let me explain
Explanation:
Line I: y=4
Line m:y=-2x+4
Line n: y=x-1
If you want more information tell me so i can edit the answer.
For finding the slope of each line use this formula:
m= y2-y1/x2-x1
You need two points which are on each line.
After finding slope this is the formula for line
y2-y1=m(x2-x1)
If you use this two formulas you can find each line equation.
Hope you understand.