Yes.
Some textbooks use the ordered pair to identify the y-intercept (to make sure students understand that it is a point on the y-axis); others identify it merely by a number, since the term y-intercept tells you it's on the y-axis and there is no need to say more. In my experience, the former is used by lower-level texts, and the latter by books that assume some experience with the concept.
So if you were in a class, the teacher would let you know which form is required (or if it didn't matter) in that class. For yourself, just use whatever makes most sense to you.