Try multiplying the second row by -2, adding the first row to it, and storing the result in the second row.
Show that the following is linearly independent or express one of the vectors in the set as a linear combination of the others.
{[2,1],[3,2],[1,2]}
Ok, this is what I had:
C_1*V_1 + C_2*V_2+.....+C_N*V_N = 0
2C_1+3C_2+C_3=0
C_1+2C_2+2C_3=0
But the thing is that I can't figure out how to use the method of elimination here. Help?