Hi guys, the question is:

5x+3y+6=0

3x+5y+18=0

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