This is how I would solve it . . .Solve by Gauss-Jordan method: .
Switch the equations: .
We have: .
Hi guys, the question is:
It should be solved by gauss-jordan method.
and the correct answers are x=1.5 and y=-4.5
when i put them in a matrix form and try to make column 1 row 2 to 0
by saying R2 --> r2(1/3) - r3(1/5) which is 0, but i still get the wrong answer, please help guys, thanks
Did you get as your matrix or did you use ? Both are okay but the thought processes are little different. Since there are only two rows, I don't know what you mean by " ". Did you mean , the first row?
Replacing the second row with "1/3 the second row minus 1/5 the first row gives
(If you used the second form, with -6 and -18 in the last column, just make the last column negative here.)
Is that what you got? It should be easy to finish from there.