I have these few lines that I need help with.

dv/dt = (ub/(Mo -bt)) - g

v(t) = -u ln(Mo -bt) - gt + C

1. I see that we integrated from the first to the next line, but what did we integrate?

2. How do you determine we could integrate from the first line?

3. Can you show me how to integrate whatever was integrated.

Thank you so much,

Yvonne