I've read that linear a is a precursor to mycanean linear b a precursor to Greek.
Yet, I've also read another I dependent civilization the Phoenicians had their alphabet that is our modern descended alphabet.
Which is it? Minoan linear a or Phoenician? I don't see how it can be both.
Minoan Linear A as a script is a precursor to Mycenaean Linear B the script. This script pretty much died out at the end of the Bronze Age.
Mycenaean Greek as a language is one early dialect of the Greek language.
The Phoenician script is a precursor to the classical (and modern) Greek script (as well as the Etruscan, Roman, Cyrillic, and various other alphabets).
Does that clarify things? Writers do sometimes refer to scripts and languages interchangeably, which can confuse things: I suspect that's what has caused the problem here.