colloquial language - I have some question about てけない

僕独りじゃ生きてけない

I saw this sentence, but, I actually get the meaning. It means "I can't live alone" right? But how do you translate it? What is "けない" grammar?

I tried to search a lot of websites, but I couldn't find any information about it.

Also, what is this じゃ？ I've never seen a sentence like this before. 教えてください！