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algebra URGENT!

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Solve the system using elimination.
2x – 2y = –8
x + 2y = –1

And this one:

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

Pleease help me :(

  • algebra URGENT! - ,

    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

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