[URGENT!!!] Need Mavericks back, but keeping Yosemite

hi everyone,
need mavericks back; i'm going going away later today , won't have wi-fi, have dongle bring. installation doesn't work on yosemite, should work on mavericks. i've got files , backed up, , partition ready on hdd, how can mavericks on partition, , keep yosemite?
or can create duplicate of yosemite on hdd in separate partition, , use time machine take mavericks?

guys!!

(i want keep yosemite too, won't have time reinstall later today)

 

assuming have purchased copy of mavericks in past, , partition have created large enough:

1) name new blank partition obvious. mavericks.

2) download mavericks app store

3) run installer. tell install partition named mavericks.

4) wait

5) wait more

6) you're done after 3 reboots.

edit: should install in mavericks? in you're not sure? because whole hour (or more, depending on internet speed) of rigmarole go through you're unsure about. if have capable phone (most ios, android, , wp7/7.5/8 phones), why not internet tethering?

 

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