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Algebra

posted by on .

What is the value of x in the solution of this system?
-3x-y+2z = 7
2y+z= -5
3x+6y= -21

4
2
1
3

  • Algebra - ,

    thx :)

  • Algebra - ,

    add the 1st and 3rd
    5y + 2z = -14
    from the 2nd: z = -2y-5
    plug into 5y + 2z = -14
    5y + 2(-2y-5) = -14
    y = -4

    into the 3rd:
    3x -24 = -21
    3x =3
    x = 1

    btw: z = 3

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