When you want to express that you are correct, there are numerous synonyms for the phrase "be right." You could say you were accurate, exact, precise, unequivocal, factual, or precise. If you want to sound convincing, you could say that you were certain, definite, undeniable, or incontrovertible. Alternatively, you could say that you were spot-on, on the money, on target, or hit the nail on the head. Other synonyms for "be right" include being on the right track, justified, valid, and accurate. Whatever synonym you choose, make sure you express your confidence in what you are saying.