college algebra

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2x+y=-2 (1)
x+y-z=-4 (2)
3x+5y+z=0 (3)
solve the system
need help quick!

  • college algebra -

    add the last two:
    4x + 6y = -4
    from the 1st: y = -2-2x

    sub into above new equation:
    4x + 6(-2-2x) = -4
    4x - 12 - 12x = -4
    -8x = 8
    x = -1

    then y = -2+2 = 0

    in the 2nd:
    x+y-z=-4
    -1+0-z=-4
    -z=-3
    z=3

    x=-1
    y=0
    z=3

  • college algebra -

    12x+4y+2z=-7 (1)
    3x-12y+6z=-4 (2)
    9x-16y+4z=-3 (3)
    solve the system
    just need the steps how to do it

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