So you are finding M
90+x+15+3x+15=180
4x=60
X = 15
LMN = 15+15
LMN = 30
hopefully this is correct :)
Answer: 0 slope, horizontal line.
Step-by-step explanation:
when using y2-y1/x2-x1, you would get 8-(-3)/5-5. This simplifies to 11/0, which means that the line would have 0 slope. A line with 0 slope is a horizontal line.
simplified is 
I got this by dividing both the numerator and denominator by 4
Hope this helps
-AaronWiseIsBae
3x-12>15
3x>15+12
3x÷3>27÷3
x>9