Alright, this summer I have forgotten a lot of what I have learned last year, so I have come to you guys for some help!

I have a few questions, but I'll probably have to add more later.

I want to learn how to do these, not just given the answer, could you break it down step by step?

Here you have to factor and solve for x

Here, you have to solve for Z:

4x + 10yz = 0

y^2+3yz-8z-4x=0

Thank you