On having multiple mortgages

[Wendy Wood]

Hi everyone! I'm a brand spankin' newbie at all of this. I'm still in the learning-all-I-can phase, really. Something I've observed in listening to the podcast and reading all the articles is how investors are getting conventional loans for their investments. I've always understood that you cannot get loans like that unless your income statements show that you can afford it aka debt to income ratios. 

What does it look like from an investor side? Does the cash flow snowball enough eventually that it adds up to be enough? What I'm seeing is house A brings in $4k, house B brings in maybe $5k, but that's just $9k/yr in income. 

I know I'm missing something. Help?

Thanks :)