MLB Daily Line Question

[ripdog]

I'll apologize now--I'm sure this question comes up all the time but I can't find my answer in a search of the Sports Betting forum.

The Seattle Times sports section has Milwaukee (at -135) over St. Louis (at +125), so if I pick the Brewers I'm betting $135 to win $100, correct? If I pick St. Louis, I'm betting $100 to win $125, yes? (seems like a slam dunk)

A few days ago the line for NYY vs. Tampa Bay was something along the lines of NYY -250 and TB +220. Does this mean that I'm betting $250 to win $100 on NYY and $100 to win $220 on TB? So if I bet $100 and take NYY, I win $40 when the Yankees win?

Thanks in advance for your responses.