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use elimination

what does that mean?

multiply -3 to the first equation
multiply 2 to the second equation

we have to use matrix

idea is to get rid of one variable at a time
matrix - even better
can you put it in the calculator?

|dw:1338861644110:dw|

hahah. no calculators.. this is linear algebra

yes, well the idea is still the same except with not using the variables

if i get a matrix of numbers and when it simplifies:
1 0 3 8
0 0 9 3
0 0 8 9

these are arbitrarty numbers but if i get two rows that have 0 0 does that mean its bad?

|dw:1338861963247:dw|
this is your goal in the end

if it has a solution

right, but if you have any rows that are all zeros that means what?

|dw:1338862078583:dw|

k, like::
2 4 6 -8
3 6 7 10

this one has a solution
x=-1, y=-2, z=3

I think that is called row multiplication

http://www.wyzant.com/Help/Math/Precalculus/Systems_Of_Equations/Matrix_Method.aspx

not sure, I put it in my calculator and it does have a solution

sorry reposted your question but label it, must use the matrix (linear algebra)
good luck :) sorry