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4x=-18
x=-4,5
b)2x=-12
x=-6
c)x+y=5 /*(-1)
x-2y=-1
-x-y=-5
x-2y=-1
-3y=-6
y=2
x=3
d) x-2y=4
x-2y=-3
0=1
układ sprzeczny
2. dla x=1
a) y=2+1
y=3
b) y=-3
y=-3
c)y=
y=-3
dla x=-1
a) y=3
b) y=-3
c) y=3
3.Ob=3a
a=6
P=
P=36cm