Question

Solve the system:
x+y+z=4
x+2y-z=2
3z=x-3y

Answer 1

matrix time

Answer 2

100% agree

Answer 3

set it up as a matrix

Answer 4

or elimination

Answer 5

@texaschic101 not easy to go on that way

Answer 6

how would you use elimination for this problem?

Answer 7

you are better set up matrix, texaschic off line. cannot guide you

Answer 8

Not really that hard with elimination.

\[x+y+z=4\]\[x+2y-z=2\]\[-x+3y +3z= 0\]
Add rows 1 and 2 to get \[2x+3y = 6\]
Add rows 2 (mult by 3) and 3 to get \[2x+9y = 6\]Subtract the two resulting rows to get an equation that is very easy to solve :-) Plug result into previous equations.

Answer 9

I prefer elimination....that is just my opinion