A lot of Egyptian slaves were Hebrews. So, according to the book, The Exodus, Moses had gone to Egypt to free the Hebrews. So I'm pretty sure that means that they were already in Egypt.
Taking a step back from there, because they had to actually go to the land in the first place, in the year 979 a lot of Jews(Hebrews)went to settle in Egypt.
Also, I found on the internet that about 120,000 Jewish slaves were freed by Judea and taken to Egypt.
This is a lot of different information. I had a very hard time figuring this out. I hope this helps!
~CaityConcerto :)
