7.G.B.5: Use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and solve simple equations for an unknown angle in a figure.
Students will learn what complementary and supplementary angles are. Then they'll learn how to find one missing angle, given that both angles are complementary or supplementary. Students will learn how to do this for both degrees and radians. Finally, students will practice solving linear equations involving complementary and supplementary angles in degrees. Here's an example. Before attempting this section, you should know how to solve two-step equations.
TODO: Some of these problems involve solving multi-step equations. Should combining like terms be considered a "step" in solving linear equations? (I now realize the answer is no. A step should be an operation which alters both sides. For example, divide both sides by two. I will have to bring some of the videos from solving multi-step equations into the two-step bucket.)