Solve the system using elimination.

Question

2x – 2y = –8
x + 2y = –1

And this one:

Solve the system using elimination.
3x – y = 28
3x + y = 14

Pleease help me :(

Answer 1

1st:
add them
3x = -9
x = -3
back into #2
-3 + 2y = -1
2y = 2
y = 1

2nd:
add them
6x = 42
x = 7
in the 2nd:
21 + y = 14
y = -7