Supplementary angles add to?
Advanced: Write an equation and solve for x in the diagram
![Supplementary angles add toAdvanced Write an equation and solve for x in the diagram class=](https://us-static.z-dn.net/files/deb/4bee32c0a9bebb32a0ab869b65adfa8e.png)
Supplementary angles add up to 180 degrees.
7x + 3x = 180 degrees.
Combine like terms.
10x = 180 degrees.
Divide both sides by 10
x = 18