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2x-y=1
3x-y=-1
b) x+4y=-2
3x-8y=10
4x-4y=8
c) x-2y=3
-2x+y=0
-x-y=3
d) 2x+y=9
5x-4y=3
7x-3y=12
e) 3x-2y=5
2x-y=4
5x-3y=9
f) 2x+9y=-9
-3x+3y=8
-x+12y=-1
g) 2x+3y=4
8x-5y=-1
10x-2y=3
h) x-y=0
x+y+z=4
x+2y+3z=9
3x+2y+4z=13
nie wiem czy o to chodziło:)