You can put this solution on YOUR website! WRITE WHAT YOU KNOW
Supplementary=180
<1=x+18
<2=4x+2
For supplementary you need two angles to ADD together to get 180. You have all the angles and what it is going to equal in the end so write this down in a formula.
Add like terms
Subtract 20 on both sides
Divide 5 on both sides.
Answer.
Make sure you try the problem and think before asking for help. If you just ask for help and only get the answers when the test comes you won't remember what you're doing or how to do it.