Just FYI, this belongs in the homework section, but anyway: all's you need to do is find an equation such that the vector whose entries are the coefficents of the x, y and z variables is not a linear combination of the two vectors obtained from the other two eqautions. Pretty much all you need to do is make a guess and check that it works. To make life easy you should probably pick an easy equation like x=something.Naeem said:I have a system of equations
2x + 4y - z = 2
x - y + 2z = 1
I need to find a third equation so that there is a unique solution for the unknows x , y and z, and find them.