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rebecca1233
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
x + 4y – 10 –x + 4y – 10 –x – 4y – 10 x – 4y – 10
hi did you see the first equation? solve it for z ? what did you get?