Answer:
1. Si tú estés rico, podrías cambiar el mundo.
Because it isn't true; it's not reality. You're proposing a hypothetical scenario.
2. A mi maestra le gustaría que nosotros aprendamos más rápido.
Because this refers to what the teacher wants, say, in an ideal world (which doesn't exist). It is her hope, her wish.
Explanation:
