Probably Not. You have to redownload it from the app store, assuming you activated the iLife apps on your AppleID. If you didn't activate them and did a clean install then I believe you're going to have to purchase them on the App Store.
All the original installation media had a version of iLife... search the USB that came with your MBA for the iLife package. It should be there, I dont know what version of iLife is included though...