Solving systems i dont know how i need with examples

To solve systems of equations you have 3 ways: Substitution, Elimination, and Graphing.
For graphing you could use desmos or a graphing calculator.
For substitution, you solve for x or y on one of your equations and, for example, let's say you solve for x, you take whatever x equals to (EX. x=y+2) and plug it into your other equation (EX. 3(y+2)-y=3)
For elimination, get x or y to be the same number but opposites (one positive one negative) then you "add" the two systems together and then you should end up with #x=# or #y=#, (EX. 2x=6) last step is to divide.

Hope this helps