Hi! Can someone please help me solve all these. Will appreciate it and mark as brainliest! Thanks a lot.

Ireally don't understand this, i'm really an idiot but i want to know how to figure this out. !

What's the answer to this question 5x-15=-65

To start to solve the system of equations below, which number would you multiply in the equation -2x-5y=-1? the two equations are -2x-5y=-1 and 4x+2y=8