Răspuns :
3x+3y= 0
5x- y=12 l·3
3x+3y= 0
15x-3y=36
_________
18x / =36 =>x=2 =>y=(-2)
4x+3-5+3y=0
x-y=0
4x+3y=2
x- y=0 l·3
4x+3y=2
3x-3y=0
________
7x / =2 =>x=2/7 =>y=2/7
7x- y=16 l·2
3x+2y= 2
14x-2y=32
3x+2y= 2
_________
17x / =34 =>x=2 =>y=(-2)
5x- y=12 l·3
3x+3y= 0
15x-3y=36
_________
18x / =36 =>x=2 =>y=(-2)
4x+3-5+3y=0
x-y=0
4x+3y=2
x- y=0 l·3
4x+3y=2
3x-3y=0
________
7x / =2 =>x=2/7 =>y=2/7
7x- y=16 l·2
3x+2y= 2
14x-2y=32
3x+2y= 2
_________
17x / =34 =>x=2 =>y=(-2)