I need to find if

3

-1

2

is a linear combination of

1 3 2

-1 1 2

2 -2 -4

I set it up so i had 3 equations they were

3 = x1 + 3x2 +2x3

-1 = -x1 + x2 + 2x3

2 = 2x1 - 2x2 - 4x3

where x1, x2, and x3 are variables. I should be able to solve these and then find the values of the variables and those are the #'s which will make the linear combination possible. But I can't figure it out!!! Help!!!