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a1=a2
k-3=1/2 k-4
k-1/2 k=-4+3
1/2 k= -1 /*2
k=-2
b)
y=x+2
y=-2x+7
------------ _
3x+9=0
3x=-9
x=-3
y=-3+2=-1
Odp. P=(-3, -1)