Y=2/3x-5
That is the regular slope-intercept form
Answer:

Step-by-step explanation:
Collect like terms

Collect like terms again and you get 
Hope this helps ʕ•ᴥ•ʔ
X-4+x=20
2x=20+4
2x=24
X=12
Number is 12 because 12-4 is 8 and 8+12 is 20
3x+75=180( cause supplementary angles)
-75 -75
3x=105
3x/3= 105/3
x=35