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rebecca1233

  • 3 years ago

The following system is solved by substitution. Which expression is substituted for z in the second and third equations? x + 4y + z = –10 3x – 3y + 6z = –21 x + 2y + 2z = –10

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  1. rebecca1233
    • 3 years ago
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    x + 4y – 10 –x + 4y – 10 –x – 4y – 10 x – 4y – 10

  2. mark_o.
    • 3 years ago
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    hi did you see the first equation? solve it for z ? what did you get?

  3. mark_o.
    • 3 years ago
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    @ rebecca1233

  4. mark_o.
    • 3 years ago
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    z=__________________?

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