How do you solve the following system of two equations in three variables given $x + 2y + z = 4$ and $3x - y - 4z = -9$ ?

Question

4214 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2015-03-28T17:44:27

There is no complete solution. If you have $3$ variables you need $3$ restricting equations to (possibly) find fixed values for your variables.

At best, by combining these equations in the normal way, you could get
$x=z-2$
and
$y= 3-z$

How do you solve the following system of two equations in three variables given x + 2y + z = 4x + 2y + z = 4 and 3x - y - 4z = -93x - y - 4z = -9?