3x-y=9 2x+y=1
No need to post your question several times. Add the two equations. What do you get? Code: 3x - y = 9 2x + y = 1 5x + 0 = 10 Then, go on, that should be easy now.
3x - y = 9 2x + y = 1 5x + 0 = 10