Question

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

Answer 1

x + 4y – 10

–x + 4y – 10

–x – 4y – 10

x – 4y – 10

Answer 2

hi did you see the first equation? solve it for z ? what did you get?

Answer 3

@ rebecca1233

Answer 4

z=__________________?