Can you PLSS help me answer these question?

AND PLS GIVE A EASY + DETAILED STEP BY STEP ON HOW U GOT THE ANSWER BC IM SLOW LOL

1. 3x - 2y = 11
x + 2y=9

2. 3x + y= 9
2x+ y = 5

3. -x - 2y=4
3x + 2y=4

4. x + 3y= (-2)
3x + 4y= (-1)