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2x+y=-3/*3
x-3y=2
6x+3y=-9
___________
7x=-7/:1
x=-1
2x+y=-3
y=-3+2
y=-1
b) -3x+2y=-7
4x-y=11/*2
-3x+2y=-7
8x-2y=22
____________
5x=15/:5
x=3
4x-y=11
-y=11-12
-y=-1/*-1
y=1
2x+y=-3/*3
x-3y=2
6x+3y=-9
7x=-7/:1
x=-1
2x+y=-3
y=-3+2
y=-1
b) -3x+2y=-7
4x-y=11/*2
-3x+2y=-7
8x-2y=22
5x=15/:5
x=3
4x-y=11
-y=11-12
-y=-1/*-1
y=1
Licze na naj;*
x=2+3y
2x+y=-3
2(2+3y)+y=-3
4+6y+y=-3
7y=-3-4
7y=-7/7
y=-1
x=2+3(-1)
x=2-3
x=-1
2)
-3x+2y=-7
4x-y=11
-y=11-4x/(-1)
y=-11+4x
-3x+2(-11+4X)=-7
-3x-22+8x=-7
5x=-7+22
5x=15/5
x=3
4x-y=11
4*3-y=11
12-y=11
y=1