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Mathematics 13 Online
OpenStudy (anonymous):

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

OpenStudy (anonymous):

Solve for z in the first equation.

OpenStudy (anonymous):

Like Aylin said, you only have to solve the first equation for z: \[x+4y+z=-10 <=> z = -10 - x - 4y\]

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