Integration by Substitution and U-Sub PowerPoint. This presentation shows how to "undo" chain rule with examples incorporating power rule, logarithms, the natural base e, radical expressions, and trigonometry. This PowerPoint was originally used over four 50 minute Calculus College Preparatory classes. However, the slides can be easily moved around or edited to fit the pacing for your classroom. Additional practice, challenge problems, and "you tries" are included throughout the powerpoint.