12 - Reducible Second Order ODEs - Missing Y

THIS LECTURE IS OPTIONAL. YOU WILL MOST PROBABLY NOT NEED THIS FOR THE TEST, WE WILL ONLY BE DEALING WITH CONSTANT COEFFICIENT ODEs. You can skip this lecture if you feel like it.

Our first case will be when y is the variable that we lose.
Let P represent the first derivative of y.

Well well. What do we have here?